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A037291 Number of rings with 1 containing n elements. 5
1, 1, 1, 4, 1, 1, 1, 11, 4, 1, 1, 4, 1, 1, 1, 50, 1, 4, 1, 4, 1, 1, 1, 11, 4, 1, 12, 4, 1, 1, 1, 208, 1, 1, 1, 16, 1, 1, 1, 11, 1, 1, 1, 4, 4, 1, 1, 50, 4, 4, 1, 4, 1, 11, 1, 11, 1, 1, 1, 4, 1, 1, 4 (list; graph; refs; listen; history; internal format)
OFFSET

1,4

LINKS

C. Noebauer, Home page

CROSSREFS

Cf. A027623, A037221.

Sequence in context: A184729 A127707 A113196 * A063851 A124777 A203639

Adjacent sequences:  A037288 A037289 A037290 * A037292 A037293 A037294

KEYWORD

nonn,nice,hard

AUTHOR

Christian G. Bower (bowerc(AT)usa.net), Jun 15 1998.

EXTENSIONS

a(16) and a(32)-A(63) from Christof Noebauer (christof.noebauer(AT)algebra.uni-linz.ac.at), Sep 29, 2000

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Last modified February 14 23:53 EST 2012. Contains 205689 sequences.