OFFSET
0,3
REFERENCES
Szekeres, G. The average value of skew Hadamard matrices. Proceedings of the First Australian Conference on Combinatorial Mathematics (Univ. Newcastle, Newcastle, 1972), pp. 55--59. Univ. of Newcastle Res. Associates, Newcastle, 1972. MR0349708 (50 #2201)
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 0..200
FORMULA
a(n) ~ n! * 1/4*exp(2*sqrt(n)-3/2)/sqrt(2*Pi)* (1 + 181/(48*sqrt(n))). - Vaclav Kotesovec, Feb 12 2013
MATHEMATICA
CoefficientList[Series[(1-x^2)^(-3/2)*E^(-x^2+x/(1-x)), {x, 0, 20}], x]* Range[0, 20]! (* Vaclav Kotesovec, Feb 12 2013 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Mar 22 2012
STATUS
approved