A091822 a(n)=2*sum(k=0,n,sum(i=0,k,sum(j=0,i, A010060(j))))-(1/6)*(n^3+6*n^2+11*n-6).

0, 0, 0, 1, 2, 2, 2, 3, 4, 4, 4, 3, 2, 2, 2, 3, 4, 4, 4, 3, 2, 2, 2, 1, 0, 0, 0, 1, 2, 2, 2, 3, 4, 4, 4, 3, 2, 2, 2, 1, 0, 0, 0, 1, 2, 2, 2, 1, 0, 0, 0, 1, 2, 2, 2, 3, 4, 4, 4, 3, 2, 2, 2, 3, 4, 4, 4, 3, 2, 2, 2, 1, 0, 0, 0, 1, 2, 2, 2, 1, 0, 0, 0, 1, 2, 2, 2, 3, 4, 4, 4, 3, 2, 2, 2, 1, 0, 0, 0, 1

Offset

1,5

Links

Table of n, a(n) for n=1..100.

Formula

a(4n+1)=a(4n+2)=a(4n+3)=2*A076826(n); a(8n)=a(8n+4)=2*A010060(n)+1

Crossrefs

Sequence in context: A054225 A322210 A228482 * A358178 A173022 A060973

Adjacent sequences: A091819 A091820 A091821 * A091823 A091824 A091825

Keyword

nonn

Author

Benoit Cloitre, Mar 08 2004

Status

approved