A100584 a(n) = A000676(n) - A000677(n).

1, 1, -1, 1, 0, 1, 0, 3, 1, 7, 4, 19, 17, 63, 77, 217, 326, 815, 1435, 3533, 7227, 17709, 39704, 97010, 228123, 561216, 1366962, 3423504, 8601350, 22000341, 56612480, 147248370, 384885631

Offset: 0

Author

N. J. A. Sloane, Dec 01 2004

Keywords

• sign

Links

• Jean-François Alcover, Table of n, a(n) for n = 0..100

Crossrefs

Cf. A000055, A000676, A000677.

Formula

a(n) = A000055(n) - 2*A000677(n). - Jean-François Alcover, Aug 23 2022