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A131911 2*A131821 - A128174. 1
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 (list; table; graph; refs; listen; history; text; internal format)
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

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Last modified May 20 08:18 EDT 2022. Contains 353852 sequences. (Running on oeis4.)