A134838 Triangle read by rows, n-th row = first n terms of an array formed by A051731 * A051731(transform).

1, 1, 2, 1, 1, 2, 1, 2, 1, 3, 1, 1, 1, 2, 1, 2, 2, 2, 1, 4, 1, 1, 1, 1, 1, 1, 2, 1, 2, 2, 2, 1, 4, 1, 1, 1, 1, 1, 1, 2, 1, 2, 1, 3, 1, 2, 1, 4, 1, 1, 2, 1, 1, 2, 1, 1, 3, 1, 2, 1, 2, 2, 2, 1, 2, 1, 4

Offset

1,3

Comments

Row sums = sigma(n), A000203: (1, 3, 4, 7, 6, 12, 8, ...).

Right border = d(n), A000005: (1, 2, 2, 3, 2, 4, 2, 4, ...).

Links

Table of n, a(n) for n=1..67.

Formula

Given the transform A051731 * A051731(transform), extract the first n terms of each row to form the triangle.

Example

First few rows of the array:
  1, 1, 1, 1, 1, 1, 1, ...
  1, 2, 1, 2, 1, 2, 1, ...
  1, 1, 2, 1, 1, 2, 1, ...
  1, 2, 1, 3, 1, 2, 1, ...
  1, 1, 1, 1, 2, 1, 1, ...
  1, 2, 2, 2, 1, 4, 1, ...
  ...
First few rows of the triangle:
  1;
  1, 2;
  1, 1, 2;
  1, 2, 1, 3;
  1, 1, 1, 1, 2;
  1, 2, 2, 2, 1, 4;
  1, 1, 1, 1, 1, 1, 2;
  1, 2, 1, 3, 1, 2, 1, 4;
  1, 1, 2, 1, 1, 2, 1, 1, 3;
  1, 2, 1, 2, 2, 2, 1, 2, 1, 4;
  ...

Crossrefs

Cf. A051731, A000203, A000005.

Sequence in context: A084746 A128259 A051194 * A049843 A131374 A360286

Adjacent sequences: A134835 A134836 A134837 * A134839 A134840 A134841

Keyword

nonn,tabl

Author

Gary W. Adamson, Nov 12 2007

Status

approved