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A166455 Triangle read by rows, twice Pascal's triangle minus Sierpinski's gasket, 2*A007318 -A047999 1
1, 1, 1, 1, 4, 1, 1, 5, 5, 1, 1, 8, 12, 8, 1, 1, 9, 20, 20, 9, 1, 1, 12, 29, 40, 29, 1, 1, 13, 41, 69, 69, 41, 13, 1, 1, 16, 56, 112, 140, 112, 56, 16, 1, 1, 17, 72, 168, 252, 252, 168, 72, 17, 1 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

0,5

COMMENTS

Row sums = A166456: (1, 2, 6, 12, 30, 60, 124,...).

LINKS

Table of n, a(n) for n=0..53.

FORMULA

Triangle read by rows, 2*A007318 - A047999

EXAMPLE

First few rows of the triangle =

1;

1, 1;

1, 4, 1;

1, 5, 5, 1;

1, 8, 12, 8, 1;

1, 9, 20, 20, 9, 1;

1, 12, 29, 40, 29, 12, 1;

1, 13, 41, 69, 69, 41, 13, 1;

1, 16, 56, 112, 140, 112, 56, 16, 1;

1, 17, 72, 168, 252, 252, 168, 72, 17, 1;

1, 20, 89, 240, 420, 504, 420, 240, 89, 20, 1;

1, 21, 109, 329, 660, 924, 924, 660, 329, 109, 21, 1;

1, 24, 132, 440, 989, 1584, 1848, 1584, 989, 440, 132, 24, 1;

...

CROSSREFS

A047999, A166456

Sequence in context: A143334 A156050 A136489 * A171142 A174037 A173077

Adjacent sequences:  A166452 A166453 A166454 * A166456 A166457 A166458

KEYWORD

nonn,tabl

AUTHOR

Gary W. Adamson, Oct 14 2009

STATUS

approved

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Last modified June 18 06:56 EDT 2019. Contains 324203 sequences. (Running on oeis4.)