A256401 Numerators of coefficients of expansion of exp(-Sum_{k=0..oo} x^(2^k)/2^k ) in powers of x.

1, -1, 0, 1, -1, 1, 1, -5, -8, 43, -74, -559, 697, -13232, -30727, 450991, -5519014, 8250311, 59081053, -2113948301, 19352683736, -113555728681, -4421555920, 10403170713454, 4947541575776, -1037548987977353, 4668788227294924, 20521746955820009

Offset

0,8

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 A256402. Cf. A256400.

Sequence in context: A342021 A130223 A126750 * A109292 A275571 A192379

Adjacent sequences: A256398 A256399 A256400 * A256402 A256403 A256404

Keyword

sign,frac

Author

N. J. A. Sloane, Mar 29 2015

Extensions

a(18)-a(27) from Hiroaki Yamanouchi, Mar 30 2015

Status

approved