



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



