A127800 - OEIS

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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

(list; table; graph; refs; listen; history; text; internal format)

OFFSET

0,3

COMMENTS

Row sums are A069517 (conjecture).

LINKS

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

EXAMPLE

Triangle begins

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

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