A136581 Triangle read by rows: A136572 * A128174.

1, 0, 1, 2, 0, 2, 0, 6, 0, 6, 24, 0, 24, 0, 24, 0, 120, 0, 120, 0, 120, 720, 0, 720, 0, 720, 0, 720, 0, 5040, 0, 5040, 0, 5040, 0, 5040

Offset

0,4

Comments

Row sums = A052558: (1, 1, 4, 12, 72, 360, ...).

Links

Table of n, a(n) for n=0..35.

Formula

A136572 * A128174 as infinite lower triangular matrices.

Example

First few rows of the triangle:
   1;
   0,   1;
   2,   0,   2;
   0,   6,   0,   6;
  24,   0,  24,   0,  24;
   0, 120,   0, 120,   0, 120;
  ...

Crossrefs

Cf. A000142, A052558, A128174, A136572.

Sequence in context: A042970 A158327 A368707 * A364558 A364559 A354607

Adjacent sequences: A136578 A136579 A136580 * A136582 A136583 A136584

Keyword

nonn,tabl

Author

Gary W. Adamson, Jan 09 2008

Status

approved