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A131247 2*A052509 - A000012. 1
1, 1, 1, 1, 3, 1, 1, 5, 3, 1, 1, 7, 7, 3, 1, 1, 9, 13, 7, 3, 1, 1, 11, 21, 15, 7, 3, 1, 1, 13, 31, 29, 15, 7, 3, 1, 1, 15, 43, 51, 31, 15, 7, 3, 1, 1, 17, 57, 83, 61, 31, 15, 7, 3, 1 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

0,5

COMMENTS

Row sums = A104161 starting (1, 2, 5, 10, 19, 34, 59,...). Reversal, A131248 is generated from 2*A004070 - A000012.

LINKS

Table of n, a(n) for n=0..54.

FORMULA

2*A052509 - A000012, where A000012 = (1; 1,1; 1,1,1;...).

EXAMPLE

First few rows of the triangle are:

1;

1, 1;

1, 3, 1;

1, 5, 3, 1;

1, 7, 7, 3, 1;

1, 9, 13, 7, 3, 1;

1, 11, 21, 15, 7, 3, 1;

...

CROSSREFS

Cf. A052509, A104161, A004070, A131248.

Sequence in context: A229288 A181109 A152720 * A114278 A134836 A180955

Adjacent sequences:  A131244 A131245 A131246 * A131248 A131249 A131250

KEYWORD

nonn,tabl

AUTHOR

Gary W. Adamson, Jun 23 2007

STATUS

approved

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Last modified October 22 09:31 EDT 2019. Contains 328315 sequences. (Running on oeis4.)