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A132733 Triangle read by rows: 2*A132731 - A000012 as infinite lower triangular matrices. 1
1, 1, 1, 1, 3, 1, 1, 7, 7, 1, 1, 11, 19, 11, 1, 1, 15, 35, 35, 15, 1, 1, 19, 55, 75, 55, 19, 1, 1, 23, 79, 135, 135, 79, 23, 1, 1, 27, 107, 219, 275, 219, 107, 27, 1, 1, 31, 139, 331, 499, 499, 331, 139, 31, 1, 1, 35, 175, 475, 835, 1003, 835, 475, 175, 35, 1 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

0,5

COMMENTS

Row sums = A132734: (1, 2, 5, 16, 43, 102, 225,...).

LINKS

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

EXAMPLE

First few rows of the triangle are:

1;

1, 1;

1, 3, 1;

1, 7, 7, 1;

1, 11, 19, 11, 1;

1, 15, 35, 35, 15, 1;

1, 19, 55, 75, 55, 19, 1;

...

PROG

(PARI) t(n, k) =  4*binomial(n, k) + 2*((k==0) || (k==n)) - 5*(k<=n); \\ Michel Marcus, Feb 12 2014

CROSSREFS

Cf. A132731, A132734.

Sequence in context: A263861 A133800 A146900 * A082039 A176331 A157836

Adjacent sequences:  A132730 A132731 A132732 * A132734 A132735 A132736

KEYWORD

nonn,tabl

AUTHOR

Gary W. Adamson, Aug 26 2007

EXTENSIONS

More terms from Michel Marcus, Feb 12 2014

STATUS

approved

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Last modified October 16 06:05 EDT 2019. Contains 328046 sequences. (Running on oeis4.)