A158905 Triangle read by rows, A000012 * A158902

1, 3, 1, 6, 1, 1, 11, 2, 1, 1, 16, 2, 1, 1, 1, 25, 3, 2, 1, 1, 1, 32, 3, 2, 1, 1, 1, 1, 44, 4, 2, 2, 1, 1, 1, 1, 55, 4, 3, 2, 1, 1, 1, 1, 1, 70, 5, 3, 2, 2, 1, 1, 1, 1, 1, 81, 5, 3, 2, 2, 1, 1, 1, 1, 1, 1, 104, 6, 4, 3, 2, 2, 1, 1, 1, 1, 1, 1

Offset

1,2

Comments

Row sums = A024916: (1, 4, 8, 15, 21, 33, 41,...).

Links

Table of n, a(n) for n=1..78.

Formula

Triangle read by rows, A000012 * A158902; where the A000012 multiplier takes jcolumn sums of triangle A158902 starting from the top.

Example

First few rows of the triangle =
1;
3, 1;
6, 1, 1;
11, 2, 1, 1;
16, 2, 1, 1, 1;
25, 3, 2, 1, 1, 1;
32, 3, 2, 1, 1, 1, 1;
44, 4, 2, 2, 1, 1, 1, 1;
55, 4, 3, 2, 1, 1, 1, 1, 1;
70, 5, 3, 2, 2, 1, 1, 1, 1, 1;
81, 5, 3, 2, 2, 1, 1, 1, 1, 1, 1;
104, 6, 4, 3, 2, 2, 1, 1, 1, 1, 1, 1;
117, 6, 4, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1;
138, 7, 4, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1;
...

Crossrefs

Cf. A158902, A024916

Sequence in context: A128489 A034839 A089732 * A098076 A171852 A010287

Adjacent sequences: A158902 A158903 A158904 * A158906 A158907 A158908

Keyword

nonn,tabl

Author

Gary W. Adamson & Mats Granvik, Mar 29 2009

Status

approved