A110126 Diagonal sums of a scaled Legendre triangle.

1, 0, -1, 2, 11, 12, 19, 174, 1073, 6584, 45871, 337098, 2563293, 20346204, 169904575, 1501012310, 14065496355, 139601710224, 1460544299739, 16007830782402, 182743810845223, 2163753452707580, 26506423427738891, 335585442530912862, 4389743577358599363

Offset: 0

Author

Paul Barry, Jul 13 2005

Keywords

• easy
• sign

Comments

Diagonal sums of A110124.

Formula

a(n)=sum{k=0..floor(n/2), 2^(n-2k)*LegendreP(n-2k, k)}.