A251552 a(n) = (A251551(n)-1)/2.

-1, 0, -1, 0, 0, 0, 0, 0, -1, 1, 1, 1, 1, 1, -1, 3, 3, 3, 3, 3, 3, 2, 0, 0, 0, 0, 0, 0, 0, -1, 2, 2, 5, 5, 5, 5, 5, 5, 9, 9, 10, 10, 8, 8, 8, 8, 8, 11, 11, 11, 8, 8, 8, 8, 8, 12, 12, 12, 12, 12, 11, 8, 8, 8, 8, 8, 8, 8

Offset: 1

Author

N. J. A. Sloane, Dec 18 2014

Keywords

• sign

Links

• Chai Wah Wu, Table of n, a(n) for n = 1..10000

Crossrefs

Cf. A098550, A247253, A251416, A251417, A251546-A251551.

Programs

Haskell

a251552 = flip div 2 . subtract 1 . a251551
-- Reinhard Zumkeller, Dec 19 2014