OFFSET
0,2
LINKS
Alois P. Heinz, Table of n, a(n) for n = 0..386
N. J. A. Sloane, Transforms
FORMULA
a(n) = A292975(n,n).
a(n) ~ (1 + sin(1)) / cos(1) * n^n. - Vaclav Kotesovec, Oct 06 2017
MAPLE
b:= proc(u, o) option remember; `if`(u+o=0, 1,
add(b(o-1+j, u-j), j=1..u))
end:
A:= proc(n, k) option remember; `if`(k=0, b(n, 0),
add(binomial(n, j)*A(j, k-1), j=0..n))
end:
a:= n-> A(n$2):
seq(a(n), n=0..20); # Alois P. Heinz, Sep 27 2017
MATHEMATICA
Table[n! SeriesCoefficient[Exp[n x] (Sec[x] + Tan[x]), {x, 0, n}], {n, 0, 20}]
CROSSREFS
KEYWORD
nonn
AUTHOR
Ilya Gutkovskiy, Sep 27 2017
STATUS
approved