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A131876 2*A131873 - A000012. 2
1, 15, 7, 29, 15, 13, 43, 23, 21, 19, 57, 31, 29, 27, 25, 71, 39, 37, 35, 33, 31, 85, 47, 45, 43, 41, 39, 37, 99, 55, 53, 51, 49, 47, 45, 43, 113, 63, 61, 59, 57, 55, 53, 51, 49, 127, 71, 69, 67, 65, 63, 61, 59, 57, 55 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

Left column = 14n + 1, A131877: (1, 15, 29, 43, 57, 21,...). Right border = 6n + 1, A016921: (1, 7, 13, 19,...). Row sums = A131878 (1, 22, 57, 106, 169,...).

LINKS

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

FORMULA

2*A131873 - A000012 as infinite lower triangular matrices.

EXAMPLE

First few rows of the triangle are:

1;

15, 7;

29, 15, 13;

43, 23, 21, 19;

57, 31, 29, 27, 25;

71, 39, 37, 35, 33, 31;

85, 47, 45, 43, 41, 39, 37;

...

CROSSREFS

Cf. A131877, A131878, A131873.

Sequence in context: A133817 A173447 A168211 * A325136 A126070 A305998

Adjacent sequences:  A131873 A131874 A131875 * A131877 A131878 A131879

KEYWORD

nonn,tabl

AUTHOR

Gary W. Adamson, Jul 22 2007

STATUS

approved

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Last modified July 8 01:48 EDT 2020. Contains 335502 sequences. (Running on oeis4.)