A131828 Square of lower triangular matrix in A131821, read by rows.

1, 6, 4, 14, 5, 9, 25, 7, 7, 16, 39, 9, 9, 9, 25, 56, 11, 11, 11, 11, 36, 76, 13, 13, 13, 13, 13, 49, 99, 15, 15, 15, 15, 15, 15, 64, 125, 17, 17, 17, 17, 17, 17, 17, 81, 154, 19, 19, 19, 19, 19, 19, 19, 19, 100

Offset

1,2

Comments

Left column = A095794: (1, 6, 14, 25, 39, 56, ...).

Row sums = A060544: (1, 10, 28, 55, 91, 190, ...).

Links

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

Formula

A131821^2.

Example

First few rows of the triangle:
   1;
   6,  4;
  14,  5,  9;
  25,  7,  7, 16;
  39,  9,  9,  9, 25;
  56, 11, 11, 11, 11, 36;
  76, 13, 13, 13, 13, 13, 49;
  ...

Crossrefs

Cf. A131821, A095794, A060544.

Sequence in context: A180497 A213038 A337512 * A096038 A064462 A248266

Adjacent sequences: A131825 A131826 A131827 * A131829 A131830 A131831

Keyword

nonn,tabl

Author

Gary W. Adamson, Jul 20 2007

Status

approved