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A127707 Number of commutative rings with 1 containing n elements. 1
1, 1, 1, 4, 1, 1, 1, 10, 4, 1, 1, 4, 1, 1, 1, 37, 1, 4, 1, 4, 1, 1, 1, 10, 4, 1, 11, 4, 1, 1, 1 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

COMMENTS

Is this a multiplicative function?

LINKS

Table of n, a(n) for n=1..31.

C. Noebauer, Home page [Archived copy as of 2008 from web.archive.org]

CROSSREFS

Cf. A037289, A037291, A127708.

Sequence in context: A008477 A222639 A184729 * A113196 A037291 A222317

Adjacent sequences:  A127704 A127705 A127706 * A127708 A127709 A127710

KEYWORD

more,nice,nonn

AUTHOR

Hugues Randriam (randriam(AT)enst.fr), Jan 24 2007

STATUS

approved

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Last modified December 20 17:15 EST 2014. Contains 252269 sequences.