A078661 - OEIS

A078661

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

1, 1, 2, 1, 2, 2, 3, 2, 3, 3, 4, 5, 5, 6, 7, 8, 9, 11, 12, 15, 16, 19, 21, 26, 28, 34, 36, 44, 48, 57, 63, 72, 81, 93, 104, 119, 133, 150, 169, 191, 213, 241, 268, 301, 337, 376, 420, 469, 522, 581, 647, 718, 799, 886, 982, 1088, 1205, 1333, 1474, 1627, 1798, 1981, 2188, 2406