A127800 Inverse of number triangle A(n,k) = 1/(2 - 0^n), if k <= n <= 2k, 0 otherwise.

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

Offset

0,3

Comments

Row sums are A069517 (conjecture).

Links

Table of n, a(n) for n=0..77.

Example

Triangle begins
  1;
  0,  2;
  0, -2,  2;
  0,  2, -2,  2;
  0,  0,  0, -2,  2;
  0, -2,  2,  0, -2,  2;
  0,  0,  0,  0,  0, -2,  2;
  0,  2, -2,  2,  0,  0, -2,  2;
  0,  0,  0,  0,  0,  0,  0, -2,  2;
  0,  0,  0, -2,  2,  0,  0,  0, -2,  2;
  0,  0,  0,  0,  0,  0,  0,  0,  0, -2,  2;
  0, -2,  2,  0, -2,  2,  0,  0,  0,  0, -2,  2;
  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0, -2,  2;
Inverse of triangle begins
  1;
  0, 1/2;
  0, 1/2, 1/2;
  0,  0,  1/2, 1/2;
  0,  0,  1/2, 1/2, 1/2;
  0,  0,   0,  1/2, 1/2, 1/2;
  0,  0,   0,  1/2, 1/2, 1/2, 1/2;
  0,  0,   0,   0,  1/2, 1/2, 1/2, 1/2;
  0,  0,   0,   0,  1/2, 1/2, 1/2, 1/2, 1/2;
  0,  0,   0,   0,   0,  1/2, 1/2, 1/2, 1/2, 1/2;
  0,  0,   0,   0,   0,  1/2, 1/2, 1/2, 1/2, 1/2, 1/2;

Crossrefs

Sequence in context: A279103 A318734 A029317 * A035692 A308654 A329860

Adjacent sequences: A127797 A127798 A127799 * A127801 A127802 A127803

Keyword

sign,tabl

Author

Paul Barry, Jan 29 2007

Status

approved