A127801 Inverse of number triangle A(n,k) = 1/(3 - 2*0^n) if k <= n <= 2k, 0 otherwise.

1, 0, 3, 0, -3, 3, 0, 3, -3, 3, 0, 0, 0, -3, 3, 0, -3, 3, 0, -3, 3, 0, 0, 0, 0, 0, -3, 3, 0, 3, -3, 3, 0, 0, -3, 3, 0, 0, 0, 0, 0, 0, 0, -3, 3, 0, 0, 0, -3, 3, 0, 0, 0, -3, 3, 0, 0, 0, 0, 0, 0, 0, 0, 0, -3, 3, 0, -3, 3, 0, -3, 3

Offset: 0

Author

Paul Barry, Jan 29 2007

Keywords

• sign
• tabl

Examples

			Triangle begins
  1;
  0,  3;
  0, -3,  3;
  0,  3, -3,  3;
  0,  0,  0, -3,  3;
  0, -3,  3,  0, -3,  3;
  0,  0,  0,  0,  0, -3,  3;
  0,  3, -3,  3,  0,  0, -3,  3;
  0,  0,  0,  0,  0,  0,  0, -3,  3;
  0,  0,  0, -3,  3,  0,  0,  0, -3,  3;
  0,  0,  0,  0,  0,  0,  0,  0,  0, -3,  3;
  0, -3,  3,  0, -3,  3,  0,  0,  0,  0, -3,  3;
  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0, -3,  3;
Inverse of triangle
  1;
  0, 1/3;
  0, 1/3, 1/3;
  0,  0,  1/3, 1/3;
  0,  0,  1/3, 1/3, 1/3;
  0,  0,   0,  1/3, 1/3, 1/3;
  0,  0,   0,  1/3, 1/3, 1/3, 1/3;
  0,  0,   0,   0,  1/3, 1/3, 1/3, 1/3;
  0,  0,   0,   0,  1/3, 1/3, 1/3, 1/3, 1/3;
  0,  0,   0,   0,   0,  1/3, 1/3, 1/3, 1/3, 1/3;
  0,  0,   0,   0,   0,  1/3, 1/3, 1/3, 1/3, 1/3, 1/3;
		

Crossrefs

Row sums are A127802.