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A037234 a(0) = 0; for n > 0, a(n) = number of rings with n elements. +0
1
0, 1, 2, 2, 11, 2, 4, 2, 52, 11, 4, 2, 22, 2, 4, 4, 390, 2, 22, 2, 22, 4, 4, 2, 104, 11, 4, 59, 22, 2, 8, 2 (list; graph; listen)
OFFSET

0,3

COMMENT

This entry is to accommodate those who use the convention that a(0)=0.

LINKS

Eric Weisstein's World of Mathematics, Link to a section of The World of Mathematics.

CROSSREFS

A027623 is the main entry for this sequence.

Sequence in context: A081088 A001038 A027623 this_sequence A141651 A090525 A126806

Adjacent sequences: A037231 A037232 A037233 this_sequence A037235 A037236 A037237

KEYWORD

nonn,mult

AUTHOR

N. J. A. Sloane (njas(AT)research.att.com).

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Last modified December 5 17:24 EST 2009. Contains 170342 sequences.


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