A143968 Denominators of numbers with g.f. exp(1-(1-x)^(1/2)).

1, 2, 4, 48, 384, 1920, 46080, 645120, 5160960, 185794560, 530841600, 40874803200, 280284364800, 51011754393600, 714164561510400, 42849873690624000, 1371195958099968000, 302731575164928000, 1678343852714360832000, 100120983364435968000, 1275541328062914232320000

Offset: 0

Author

N. J. A. Sloane, Dec 02 2008

Keywords

• nonn
• frac

Examples

			1, 1/2, 1/4, 7/48, 37/384, 133/1920, 2431/46080, 27007/645120, 176761/5160960, ...
		

Links

• Robert Israel, Table of n, a(n) for n = 0..406

Crossrefs

Cf. A143991 (numerators), A001515.

Programs

Maple

S:= series(exp(1-(1-x)^(1/2)),x,21):
seq(denom(coeff(S,x,i)),i=0..20); # Robert Israel, Mar 23 2023

Mathematica

CoefficientList[Series[Exp[1-Sqrt[1-x]],{x,0,20}],x]//Denominator (* Harvey P. Dale, Sep 13 2019 *)