A131911 2*A131821 - A128174.

1, 4, 3, 5, 2, 5, 8, 1, 2, 7, 9, 2, 1, 2, 9, 12, 1, 2, 1, 2, 11, 13, 2, 1, 2, 1, 2, 13, 16, 1, 2, 1, 2, 1, 2, 15, 17, 2, 1, 2, 1, 2, 1, 2, 17, 20, 1, 2, 1, 2, 1, 2, 1, 2, 19

Offset

1,2

Comments

Left column, congruent to {0, 1} mod 4, A042948: (1, 4, 5, 8, 9, 12, 13, 16, ...).

Row sums = A131912: (1, 7, 12, 18, 23, 29, 34, ...).

Links

Table of n, a(n) for n=1..55.

Formula

2*A131821 - A128174 as infinite lower triangular matrices.

Example

First few rows of the triangle:
   1;
   4,  3;
   5,  2,  5;
   8,  1,  2,  7;
   9,  2,  1,  2,  9;
  12,  1,  2,  1,  2, 11;
  13,  2,  1,  2,  1,  2, 13;
  ...

Crossrefs

Cf. A131821, A128174, A042948, A131912.

Sequence in context: A352692 A339579 A081665 * A254037 A321154 A011206

Adjacent sequences: A131908 A131909 A131910 * A131912 A131913 A131914

Keyword

nonn,tabl

Author

Gary W. Adamson, Jul 27 2007

Status

approved