A133912 First differences of A007001.

1, 1, -1, 1, 1, -2, 1, -1, 1, 1, -2, 1, 1, 1, -3, 1, -1, 1, 1, -2, 1, -1, 1, 1, -2, 1, 1, 1, -3, 1, -1, 1, 1, -2, 1, 1, 1, -3, 1, 1, 1, 1, -4, 1, -1, 1, 1, -2, 1, -1, 1, 1, -2, 1, 1, 1, -3, 1, -1, 1, 1, -2, 1, -1, 1, 1, -2, 1, 1, 1, -3, 1, -1, 1, 1, -2, 1, 1, 1, -3, 1, 1, 1, 1, -4, 1, -1, 1, 1, -2, 1, -1, 1, 1, -2, 1, 1, 1, -3, 1, -1, 1, 1, -2, 1

Offset: 1

Author

Gary W. Adamson, Sep 28 2007

Keywords

• sign

Examples

			a(5) = 1 = A007001(5) - A007001(4) = (3 - 2).
		

Crossrefs

Cf. A007001, A133913, A133914.

Extensions

More terms from Colin Barker, Apr 19 2015