A256402 Denominators of coefficients of expansion of exp(-Sum_{k=0..oo} x^(2^k)/2^k ) in powers of x.

1, 1, 1, 3, 3, 5, 45, 63, 105, 405, 14175, 17325, 18711, 552825, 14189175, 49116375, 91216125, 144729585, 97692469875, 109185701625, 1031198293125, 10257709336875, 3430178002251, 2348038513445625, 1034450533895625, 160789593855515625, 16025362854266390625

Offset: 0

Author

N. J. A. Sloane, Mar 29 2015

Keywords

• nonn
• frac

Links

• Hiroaki Yamanouchi, Table of n, a(n) for n = 0..100
• Koda, Tatsuhiko; Sato, Masaki; Takegahara, Yugen; 2-adic properties for the numbers of involutions in the alternating groups, J. Algebra Appl. 14 (2015), no. 4, 1550052 (21 pages). See Lemma 2.1.

Crossrefs

For numerators see A256401. Cf. A256400.

Extensions

a(18)-a(26) from Hiroaki Yamanouchi, Mar 30 2015