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A030247 Number of nonisomorphic idempotent groupoids. +0
5
1, 1, 3, 138, 700688, 794734575200, 307047114275109035760, 61899500454067972015948863454485, 9279375475116928325576506574232168143663715776 (list; graph; listen)
OFFSET

0,3

LINKS

Index entries for sequences related to groupoids

FORMULA

fix F[ n ]=prod{i, j >= 1}(sum{d|[ i, j ]}(d*n(d))^((i, j)*n(i)*n(j)-(i=j)n(i)))

a(n) = sum {1*s_1+2*s_2+...=n} (fix A[s_1, s_2, ...]/(1^s_1*s_1!*2^s_2*s2!*...)) where fix A[s_1, s_2, ...] = prod {i>=j>=1} f(i, j, s_i, s_j) where f(i, j, s_i, s_j) = {i=j} (sum {d|i} (d*s_d))^(i*s_i^2-s_i) or {i != j} (sum {d|lcm(i, j)} (d*s_d))^(2*gcd(i, j)*s_i*s_j)

a(n) asymptotic to (n^(n^2-n))/n! = A090588(n)/A000142(n)

CROSSREFS

Cf. A001329, A038015, A038018, A090588.

Sequence in context: A037120 A082923 A049677 this_sequence A139956 A016067 A070322

Adjacent sequences: A030244 A030245 A030246 this_sequence A030248 A030249 A030250

KEYWORD

nonn

AUTHOR

Christian G. Bower (bowerc(AT)usa.net), Feb 15 1998, May 15 1998 and Dec 03 2003

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Last modified March 17 15:31 EDT 2010. Contains 173524 sequences.


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