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

0,3

Links

Table of n, a(n) for n=0..71.

Example

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.

Sequence in context: A201582 A369881 A115379 * A096597 A097994 A318050

Adjacent sequences: A127798 A127799 A127800 * A127802 A127803 A127804

Keyword

sign,tabl

Author

Paul Barry, Jan 29 2007

Status

approved