A168312 Triangle read by rows, replace 1's of triangle A115361 starting from the right with (1, 2, 4, 8, ...).

1, 2, 1, 0, 0, 1, 4, 2, 0, 1, 0, 0, 0, 0, 1, 0, 0, 2, 0, 0, 1, 0, 0, 0, 0, 0, 0, 1, 8, 4, 0, 2, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 2, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 4, 0, 2, 0, 0, 0, 0, 0, 1

Offset

1,2

Comments

Row sums = A038712: (1, 3, 1, 7, 1, 3, 1, 15, ...).

Links

Table of n, a(n) for n=1..77.

Formula

Triangle read by rows, replace 1's in triangle A115361 starting from the right with (1, 2, 4, 8, ...).

Example

First few rows of the triangle:
   1;
   2, 1;
   0, 0, 1;
   4, 2, 0, 1;
   0, 0, 0, 0, 1;
   0, 0, 2, 0, 0, 1;
   0, 0, 0, 0, 0, 0, 1;
   8, 4, 0, 2, 0, 0, 0, 1;
   0, 0, 0, 0, 0, 0, 0, 0, 1;
   0, 0, 0, 0, 2, 0, 0, 0, 0, 1;
   0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1;
   0, 0, 4, 0, 0, 2, 0, 0, 0, 0, 0, 1;
   0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1;
   0, 0, 0, 0, 0, 0, 2, 0, 0, 0, 0, 0, 0, 1;
   0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1;
  16, 8, 0, 4, 0, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0, 1;
   0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1;
  ...

Crossrefs

Cf. A115361, A038712.

Sequence in context: A145153 A255517 A188816 * A076837 A055363 A363845

Adjacent sequences: A168309 A168310 A168311 * A168313 A168314 A168315

Keyword

nonn,tabf

Author

Gary W. Adamson, Nov 22 2009

Status

approved