OFFSET
0,3
COMMENTS
Inverse binomial transform of A000680.
LINKS
Alois P. Heinz, Table of n, a(n) for n = 0..238
FORMULA
EXAMPLE
a(2) = 5: 1212, 1221, 2112, 2121, 2211.
MAPLE
a:= proc(n) option remember; `if`(n<3, [1, 0, 5][n+1],
(n-1)*((2*n+1)*a(n-1)+(4*n-3)*a(n-2)+2*(n-2)*a(n-3)))
end:
seq(a(n), n=0..16);
CROSSREFS
KEYWORD
nonn
AUTHOR
Alois P. Heinz, Aug 05 2024
STATUS
approved