A105588 Diagonal sums of a Moebius-binomial triangle.

1, 1, 2, 2, 2, 2, 3, 3, 4, 3, 4, 4, 5, 5, 5, 5, 7, 7, 7, 7, 9, 8, 9, 8, 11, 9, 10, 9, 11, 10, 10, 10, 13, 12, 13, 12, 17, 14, 14, 14, 18, 16, 16, 17, 20, 17, 16, 16, 21, 18, 17, 17, 23, 20, 20, 18, 24, 22, 23, 21, 26, 23, 23, 22, 27, 24, 24, 24, 30, 25, 26, 24, 34, 27, 28, 26, 33, 28

Offset

0,3

Comments

Diagonal sums of A105586.

Links

Table of n, a(n) for n=0..77.

Formula

a(n)=sum{k=0..floor(n/2), binomial(abs(mu(n-k)), abs(mu(k))}

Crossrefs

Sequence in context: A134544 A230514 A106161 * A064658 A194292 A308403

Adjacent sequences: A105585 A105586 A105587 * A105589 A105590 A105591

Keyword

easy,nonn

Author

Paul Barry, Apr 14 2005

Status

approved