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A130322 A130321^2. 2
1, 4, 1, 12, 4, 1, 32, 12, 4, 1, 80, 32, 12, 4, 1, 192, 80, 32, 12, 4, 1, 448, 192, 80, 32, 12, 4, 1, 1024, 448, 192, 80, 32, 12, 4, 1, 2304, 1024, 448, 192, 80, 32, 12, 4, 1 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

Row sums = A000337: (1, 5, 17, 49, 129, 321, ...).

LINKS

Table of n, a(n) for n=0..44.

FORMULA

The square of triangle A130321 as an infinite lower triangular matrix.

A001787 in every column starting (1, 4, 12, 32, 80, 192, ...).

EXAMPLE

First few rows of the triangle:

1;

4, 1;

12, 4, 1;

32, 12, 4, 1;

80, 32, 12, 4, 1;

192, 80, 32, 12, 4, 1;

...

CROSSREFS

Cf. A130321, A001787, A000337.

Sequence in context: A080303 A145369 A145370 * A316232 A212046 A232013

Adjacent sequences: A130319 A130320 A130321 * A130323 A130324 A130325

KEYWORD

nonn,tabl

AUTHOR

Gary W. Adamson, May 24 2007

STATUS

approved

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Last modified December 6 19:33 EST 2022. Contains 358648 sequences. (Running on oeis4.)