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A131873 A131844 * A000012. 2
1, 8, 4, 15, 8, 7, 22, 12, 11, 10, 29, 16, 15, 14, 13, 36, 20, 19, 18, 17, 16, 43, 24, 23, 22, 21, 20, 19, 50, 28, 27, 26, 25, 24, 23, 22, 57, 32, 31, 30, 29, 28, 27, 26, 25, 64, 36, 35, 34, 33, 32, 31, 30, 29, 28 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

Left column = A016993, 7n + 1: (1, 8, 15, 22, 29,...). Right border = 3n + 1: (1, 4, 7, 10, 13,...). Row sums = A131874: (1, 12, 30, 55,...).

LINKS

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

FORMULA

A131844 * A000012 as infinite lower triangular matrices.

EXAMPLE

First few rows of the triangle are:

1;

8, 4;

15, 8, 7;

22, 12, 11, 10;

29, 16, 15, 14, 13;

36, 20, 19, 18, 17, 16;

43, 24, 23, 22, 21, 20, 19;

...

CROSSREFS

Cf. A131844, A131874, A016993, A131875.

Sequence in context: A244209 A156279 A203072 * A220130 A276071 A040059

Adjacent sequences:  A131870 A131871 A131872 * A131874 A131875 A131876

KEYWORD

nonn,tabl

AUTHOR

Gary W. Adamson, Jul 22 2007

STATUS

approved

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Last modified April 18 15:05 EDT 2019. Contains 322209 sequences. (Running on oeis4.)