A134577 A127170 * A127648.

1, 2, 2, 2, 0, 3, 3, 4, 0, 4, 2, 0, 0, 0, 5, 4, 4, 6, 0, 0, 6, 2, 0, 0, 0, 0, 0, 7, 4, 6, 0, 8, 0, 0, 0, 8, 3, 0, 6, 0, 0, 0, 0, 0, 9, 4, 4, 0, 0, 10, 0, 0, 0, 0, 10

Offset

1,2

Comments

Row sums = A007429: (1, 4, 5, 11, 7, 20, 9, 26, ...).

Left border = A000005: (1, 2, 2, 3, 2, 4, 2, ...).

A134577 * [1/1, 1/2, 1/3, ...] = A007425: (1, 3, 3, 6, 3, 9, 3, 10, ...).

A134577 * [1, 2, 3, ...] = A007433: (1, 6, 11, 27, 27, 66, ...).

A134577 * A000005 = A034761: (1, 6, 8, 23, 12, 48, ...).

Links

Table of n, a(n) for n=1..55.

Formula

A127170 * A127648 = A051731^2 * A127648 = A051731 * A127093.

Example

First few rows of the triangle:
  1;
  2, 2;
  2, 0, 3;
  3, 4, 0, 4;
  2, 0, 0, 0, 5
  4, 4, 6, 0, 0, 6;
  2, 0, 0, 0, 0, 0, 7;
  4, 6, 0, 8, 0, 0, 0, 8;
  ...

Crossrefs

Cf. A051731, A127170, A127648, A127093, A007429, A127170, A007433, A034761.

Sequence in context: A071443 A013586 A071441 * A071442 A174740 A124759

Adjacent sequences: A134574 A134575 A134576 * A134578 A134579 A134580

Keyword

nonn,tabl,more

Author

Gary W. Adamson, Nov 02 2007

Status

approved