A131912 -id:A131912 - cp's OEIS frontend

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

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Gary W. Adamson, Jul 27 2007

nonn
tabl

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, ...).

			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;
  ...

Cf. A131821, A128174, A042948, A131912.

2*A131821 - A128174 as infinite lower triangular matrices.

cp's OEIS Frontend

A131911 2*A131821 - A128174.

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