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A115452 A Fredholm-Rueppel related triangle. 1
1, 2, -1, 2, -3, 1, 2, -3, 3, -1, 0, 0, 2, -3, 1, -2, 3, -1, -2, 3, -1, 0, 0, 0, 0, 2, -3, 1, 2, -3, 3, -1, 0, -2, 3, -1, 0, 0, 0, 0, 0, 0, 2, -3, 1, 0, 0, -2, 3, -1, 0, 0, -2, 3, -1, 0, 0, 0, 0, 0, 0, 0, 0, 2, -3, 1, -2, 3, -1, -2, 3, -1, 0, 0, 0, -2, 3, -1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, -3, 1 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

Inverse of A115450. Row sums are Fredholm-Rueppel sequence A036987.

LINKS

Table of n, a(n) for n=0..90.

FORMULA

Inverse of (1/((1-x)(1-2x)), -x)-(x/((1-x)(1-2x)), -x^2) (expressed in the notation of Riordan arrays).

EXAMPLE

Triangle begins

1,

2, -1,

2, -3, 1,

2, -3, 3, -1,

0, 0, 2, -3, 1,

-2, 3, -1, -2, 3, -1,

0, 0, 0, 0, 2, -3, 1,

2, -3, 3, -1, 0, -2, 3, -1,

0, 0, 0, 0, 0, 0, 2, -3, 1,

0, 0, -2, 3, -1, 0, 0, -2, 3, -1,

0, 0, 0, 0, 0, 0, 0, 0, 2, -3, 1,

-2, 3, -1, -2, 3, -1, 0, 0, 0, -2, 3, -1,

0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, -3, 1

CROSSREFS

Sequence in context: A280055 A253092 A194546 * A039676 A242359 A113126

Adjacent sequences:  A115449 A115450 A115451 * A115453 A115454 A115455

KEYWORD

sign,tabl

AUTHOR

Paul Barry, Jan 22 2006

STATUS

approved

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Last modified March 5 16:55 EST 2021. Contains 341827 sequences. (Running on oeis4.)