A078658 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, 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, 171, 172, 240, 247, 335, 348, 464, 490, 639, 681, 874, 941, 1190, 1289, 1610, 1756, 2168, 2375, 2904, 3197, 3873, 4276, 5141, 5693, 6796, 7541, 8945, 9946, 11730, 13058, 15322, 17078

Offset

0,3

Comments

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

References

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

Links

Table of n, a(n) for n=0..57.

Formula

a(n) = A078657(n) + 1, n > 0. - Sean A. Irvine, Jul 09 2025

Crossrefs

Cf. A078657.

Sequence in context: A365876 A179080 A294199 * A307719 A351594 A185314

Adjacent sequences: A078655 A078656 A078657 * A078659 A078660 A078661

Keyword

nonn

Author

N. J. A. Sloane, Dec 15 2002

Status

approved