A256400 Numerators of coefficients of expansion of exp( Sum_{k=0..oo} x^(2^k)/2^k ) in powers of x.

1, 1, 1, 2, 2, 7, 16, 67, 88, 617, 2626, 18176, 6949, 423271, 2172172, 19151162, 58438907, 899510224, 7656246634, 1236339998, 460251204914, 6682341795214, 55431849118769, 58399157390146, 2845938531282919, 54648005951674444, 12207653488921678

Offset

0,4

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 denominators see A049606. Cf. A256401/A256402.

Sequence in context: A238833 A192921 A051769 * A203176 A203579 A338415

Adjacent sequences: A256397 A256398 A256399 * A256401 A256402 A256403

Keyword

nonn,frac

Author

N. J. A. Sloane, Mar 29 2015

Extensions

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

Status

approved