A047885 Array a(m,n) = pi(m+n) - pi(m) - pi(n) read by antidiagonals, where pi() = A000720 (m,n >= 0).

0, 0, 0, 0, 1, 0, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 1, 0, 0, 0, 0, -1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, -1, 0, -1, 0, 0, 0, 0, 0, -1, -1, -1, -1, -1, -1, 0, 0, 0, 0, -1, -2, -1, -2, -1, -2, -1, 0, 0

Offset: 0

Author

N. J. A. Sloane

Keywords

• sign
• tabl
• easy

Comments

A212210-A212213 are the preferred versions of this array.

Examples

			Beginning of array is
  0  0  0  0  0  0  0  0 ...
  0  1  1  0  1  0  1  0 ...
  0  1  0  0  0  0 -1 ...
  0  0  0 -1  0 -1 -1 ...
  ...
		

Crossrefs

Cf. A047886, A212210-A212213, A000720.