|
| |
| |
|
|
|
1, 4, 7, 7, 10, 13, 10, 13, 16, 19, 13, 16, 19, 22, 25, 16, 19, 22, 25, 28, 31, 19, 22, 25, 28, 31, 34, 37, 23, 26, 29, 32, 35, 38, 41, 45, 26, 29, 32, 35, 38, 41, 44, 48, 51, 29, 32, 35, 38, 41, 44, 47, 51, 54, 57
(list;
table;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
|
OFFSET
|
0,2
|
|
|
COMMENTS
|
Left border = A016777, (1, 4, 7, 10, 13,...). Right border = A016921: (1, 7, 13, 19, 25,...). Row sums = A051682, 11-gonal numbers: (1, 11, 30, 58, 95,...).
|
|
|
LINKS
|
Table of n, a(n) for n=0..54.
|
|
|
FORMULA
|
(A000012 * A131431) + (A131431 * A000012) - A000012 as infinite lower triangular matrices.
|
|
|
EXAMPLE
|
First few rows of the triangle are:
1;
4, 7;
7, 10, 13;
10, 13, 16, 19;
13, 16, 19, 22, 25;
16, 19, 22, 25, 28, 31;
19, 22, 25, 28, 31, 34, 37;
...
|
|
|
CROSSREFS
|
Cf. A131431, A016777, A016921, A051682.
Sequence in context: A159919 A310929 A310930 * A088744 A168074 A061891
Adjacent sequences: A131429 A131430 A131431 * A131433 A131434 A131435
|
|
|
KEYWORD
|
nonn,tabl
|
|
|
AUTHOR
|
Gary W. Adamson, Jul 10 2007
|
|
|
STATUS
|
approved
|
| |
|
|
