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A132731 2*A007318 + A103451 - 2*A000012. 2
1, 1, 1, 1, 2, 1, 1, 4, 4, 1, 1, 6, 10, 6, 1, 1, 8, 18, 18, 8, 1, 1, 10, 28, 38, 28, 10, 1, 1, 12, 40, 68, 68, 40, 12, 1, 1, 14, 54, 110, 138, 110, 54, 14, 1, 1, 16, 70, 166, 250, 250, 166, 70, 16, 1, 1, 18, 88, 238, 418, 502, 418, 238, 88, 18, 1 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

0,5

LINKS

Table of n, a(n) for n=0..65.

FORMULA

2*A007318 + A103451 - 2*A000012 as infinite lower triangular matrices.

EXAMPLE

First few rows of the triangle are:

1;

1, 1;

1, 2, 1;

1, 4, 4, 1;

1, 6, 10, 6, 1;

1, 8, 18, 18, 8, 1;

1, 10, 28, 38, 28, 10, 1;

1, 12, 40, 68, 68, 40, 12, 1;

...

PROG

(PARI) t(n, k) =  2*binomial(n, k) + ((k==0) || (k==n)) - 2*(k<=n); \\ Michel Marcus, Feb 12 2014

CROSSREFS

Cf. A007318, A103451, A000012. A132732 (row sums).

Sequence in context: A283796 A156580 A157528 * A128966 A055907 A259698

Adjacent sequences:  A132728 A132729 A132730 * A132732 A132733 A132734

KEYWORD

nonn,tabl

AUTHOR

Gary W. Adamson, Aug 26 2007

EXTENSIONS

Corrected by Jeremy Gardiner, Feb 02 2014

More terms from Michel Marcus, Feb 12 2014

STATUS

approved

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Last modified September 18 12:00 EDT 2019. Contains 327170 sequences. (Running on oeis4.)