A131950 - OEIS

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A131950

A002024 + A131821 + A007318 - 2*A000012 as infinite lower triangular matrices.

1, 3, 3, 5, 4, 5, 7, 6, 6, 7, 9, 8, 10, 8, 9, 11, 10, 15, 15, 10, 11, 13, 12, 21, 26, 21, 12, 13, 15, 14, 28, 42, 42, 28, 14, 15, 17, 16, 36, 64, 78, 64, 36, 16, 17, 19, 18, 45, 93, 135, 135, 93, 45, 18, 19

(list; table; graph; refs; listen; history; text; internal format)

OFFSET

0,2

COMMENTS

Row sums = A131951: (1, 6, 14, 26, 44, 72, ...).

LINKS

Table of n, a(n) for n=0..54.

EXAMPLE

First few rows of the triangle:

3, 3;

5, 4, 5;

7, 6, 6, 7;

9, 8, 10, 8, 9;

11, 10, 15, 15, 10, 11;

13, 12, 21, 26, 21, 12, 13;

15, 14, 28, 42, 42, 28, 14, 15;

...

CROSSREFS

Cf. A002024, A131821, A007318, A000012, A131951.

Sequence in context: A358241 A072820 A204004 * A116192 A090104 A333822

Adjacent sequences: A131947 A131948 A131949 * A131951 A131952 A131953

KEYWORD

nonn,tabl

AUTHOR

Gary W. Adamson, Jul 30 2007

STATUS

approved