A137629 Triangle read by rows: A026794^2 as infinite lower triangular matrix.

1, 2, 1, 4, 0, 1, 7, 2, 0, 1, 11, 2, 0, 0, 1, 18, 4, 2, 0, 0, 1, 26, 4, 2, 0, 0, 0, 1, 39, 9, 2, 2, 0, 0, 0, 1, 55, 9, 4, 2, 0, 0, 0, 0, 1, 79, 16, 4, 2, 2, 0, 0, 0, 0, 1, 106, 18, 6, 2, 2, 0, 0, 0, 0, 0, 1, 150, 29, 9, 4, 2, 2, 0, 0, 0, 0, 0, 1, 196, 33, 11, 4, 2, 2, 0, 0, 0, 0, 0, 0, 1

Offset

1,2

Links

Andrew Howroyd, Table of n, a(n) for n = 1..1275 (first 50 rows)

Example

First few rows of the triangle:
   1;
   2, 1;
   4, 0, 1;
   7, 2, 0, 1;
  11, 2, 0, 0, 1;
  18, 4, 2, 0, 0, 1;
  26, 4, 2, 0, 0, 0, 1;
  39, 9, 2, 2, 0, 0, 0, 1;
  ...

Prog

(PARI) \\ Needs MtxA026794 defined in A026794.
{ my(M=MtxA026794(12)^2); for(i=1, #M, print(M[i, 1..i])) } \\ Andrew Howroyd, Sep 21 2025

Crossrefs

Row sums are A137630.

Column 1 is A137631.

Cf. A026794.

Sequence in context: A122141 A091604 A200192 * A220504 A087569 A341509

Adjacent sequences: A137626 A137627 A137628 * A137630 A137631 A137632

Keyword

nonn,tabl

Author

Gary W. Adamson, Jan 31 2008

Status

approved