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A256400
Numerators of coefficients of expansion of exp( Sum_{k=0..oo} x^(2^k)/2^k ) in powers of x.
3
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
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
KEYWORD
nonn,frac
AUTHOR
N. J. A. Sloane, Mar 29 2015
EXTENSIONS
a(18)-a(26) from Hiroaki Yamanouchi, Mar 30 2015
STATUS
approved