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Search: id:A023813
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| 1, 8, 729, 1048576, 30517578125, 21936950640377856, 459986536544739960976801, 324518553658426726783156020576256, 8727963568087712425891397479476727340041449, 10000000000000000000000000000000000000000000000000000000
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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Determinant of n X n matrix M_(i,j)=binomial(n*i,j) - Benoit Cloitre (benoit7848c(AT)orange.fr), Sep 13 2003
Number of commutative binary operations on an n-set. Labeled commutative groupoids.
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LINKS
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Eric Postpischil Posting to sci.math newsgroup, May 21 1990
Index entries for sequences related to groupoids
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MAPLE
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seq(mul(n^k, k=1..n), n=0..10); - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Jun 03 2007
with(combinat):a:=n->mul(mul(n, i=1..k), k=0..n): seq(a(n), n=0..10); - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Jun 03 2007
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CROSSREFS
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a(n)+A079182(n)=A002489(n)
Cf. A001425, A002489, A023814, A023815.
Sequence in context: A046188 A014387 A017007 this_sequence A068895 A115590 A134923
Adjacent sequences: A023810 A023811 A023812 this_sequence A023814 A023815 A023816
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KEYWORD
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nonn
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AUTHOR
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Lyle Ramshaw (ramshaw(AT)pa.dec.com)
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EXTENSIONS
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Better description from Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Dec 29 2001
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