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

Author

Paul Barry, Apr 14 2005

Keywords

• easy
• nonn

Comments

Diagonal sums of A105586.

Crossrefs

Cf. A008683, A105586.

Formula

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