A081289 a(0) = 0, a(n) = A081293(A081288(n)-1).

0, 3, 6, 6, 6, 14, 14, 14, 14, 14, 14, 14, 14, 14, 37, 37, 37, 37, 37, 37, 37, 37, 37, 37, 37, 37, 37, 37, 37, 37, 37, 37, 37, 37, 37, 37, 37, 37, 37, 37, 37, 37, 107, 107, 107, 107, 107, 107, 107, 107, 107, 107, 107, 107, 107, 107, 107, 107, 107, 107, 107, 107, 107, 107

Offset: 0

Author

Antti Karttunen, Mar 17 2003

Keywords

• nonn

Comments

After n>0, A081293(n) occurs A000245(n) times.

Crossrefs

Cf. A000108, A000245, A081288, A081290, A081293.

Programs

PARI

A000108(n) = binomial(2*n, n)/(n+1);
A081293(n) = A000108(n) + sum(k=0, n, A000108(k));
A081288(n) = my(i=0); while(binomial(2*i, i)/(i+1) <= n, i++); i;
a(n) = if (n==0, 0, A081293(A081288(n)-1)); \\ Michel Marcus, Apr 28 2020