A131925 2*A002024 - A000012(signed).

1, 5, 3, 5, 7, 5, 9, 7, 9, 7, 9, 11, 9, 11, 9, 13, 11, 13, 11, 13, 11, 13, 15, 13, 15, 13, 15, 13, 17, 15, 17, 15, 17, 15, 17, 15, 17, 19, 17, 19, 17, 19, 17, 19, 17

Offset

0,2

Comments

Row sums = A077221: (1, 8, 17, 32, 49, 72, 97, ...).

Links

Table of n, a(n) for n=0..44.

Formula

2*A002024 - A000012 (signed + - + -, ... by columns).

A002024 = (1; 2,2; 3,3,3; ...); A000012(signed) = (1; -1,1; 1,-1,1; ...).

Example

First few rows of the triangle:
   1;
   5,  3;
   5,  7,  5;
   9,  7,  9,  7;
   9, 11,  9, 11,  9;
  13, 11, 13, 11, 13, 11;
  13, 15, 13, 15, 13, 15, 13;
  ....

Crossrefs

Cf. A002024, A000012, A077221.

Sequence in context: A092516 A269893 A336055 * A128010 A185046 A114740

Adjacent sequences: A131922 A131923 A131924 * A131926 A131927 A131928

Keyword

nonn,tabl

Author

Gary W. Adamson, Jul 29 2007

Status

approved