[go: up one dir, main page]

login

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

a(0) = 1; for n>0, a(n) = 1 + coefficient of x^n in expansion of 1/Product_{ n >= 2, n not of the form 2^k-1 } (1-x^n).
1

%I #3 Mar 30 2012 16:49:37

%S 1,1,2,1,3,2,4,2,6,4,9,6,13,10,19,15,28,24,41,36,59,55,85,81,121,119,

%T 171,172,240,247,335,348,464,490,639,681,874,941,1190,1289,1610,1756,

%U 2168,2375,2904,3197,3873,4276,5141,5693,6796,7541,8945,9946,11730,13058,15322,17078

%N a(0) = 1; for n>0, a(n) = 1 + coefficient of x^n in expansion of 1/Product_{ n >= 2, n not of the form 2^k-1 } (1-x^n).

%C a(n) = number of cobordism classes in dimension n.

%D Robert E. Stong, Notes on Cobordism Theory, Princeton Univ. Press, 1968.

%Y Cf. A078657.

%K nonn

%O 0,3

%A _N. J. A. Sloane_, Dec 15 2002