%I #7 Mar 16 2024 13:13:09
%S 1,2,11,38,263,1260,10871,66576,694599,5182960,63738259,561098224,
%T 7969169739,80865956192,1304923903919,14998292190464,271341955926479,
%U 3484403002454016,69899466563099435,991886288235459072,21861082423955691795,339715268249655012352
%N Column 2 of triangle A258829.
%H Vaclav Kotesovec, <a href="/A259213/b259213.txt">Table of n, a(n) for n = 0..460</a>
%F a(n) ~ n! * (d*(1-(-1)^n) + 1+(-1)^n)*c/2 * d^n * n^2, where d = 0.8218983778054251105765881248... = 1/(r*sqrt(2)), where r is the root of the equation cot(r)=r and c = 0.986093542875063325007949... . - _Vaclav Kotesovec_, Jun 21 2015, updated Mar 16 2024
%Y Cf. A258829, A258830.
%K nonn
%O 0,2
%A _Vaclav Kotesovec_, Jun 21 2015