A143470 Triangle read by rows, A000012 * A143316, 1 <= k <= n.

1, 3, 1, 7, 1, 1, 11, 3, 1, 1, 19, 3, 1, 1, 1, 23, 7, 3, 1, 1, 1, 35, 7, 3, 1, 1, 1, 1, 43, 11, 3, 3, 1, 1, 1, 1, 55, 11, 7, 3, 1, 1, 1, 1, 1, 63, 19, 7, 3, 3, 1, 1, 1, 1, 1, 83, 19, 7, 3, 3, 1, 1, 1, 1, 1, 1, 91, 23, 11, 7, 3, 3, 1, 1, 1, 1, 1, 1, 115, 23, 11, 7, 3, 3, 1, 1, 1, 1, 1, 1, 1

Offset

1,2

Comments

Sum of n-th row is n^2.

Duplicate of A242114.

Links

Table of n, a(n) for n=1..91.

Formula

Triangle read by rows, A000012 * A143316, 1 <= k <= n, where the operation A000012 * A143316 takes partial sums of A143316 terms by columns.

Example

First few rows of the triangle:
   1;
   3, 1;
   7, 1, 1;
  11, 3, 1, 1;
  19, 3, 1, 1, 1;
  23, 7, 3, 1, 1, 1;
  35, 7, 3, 1, 1, 1, 1;
  ...

Crossrefs

Cf. A143316, A242114.

Sequence in context: A026499 A339452 A242114 * A114580 A257597 A097229

Adjacent sequences: A143467 A143468 A143469 * A143471 A143472 A143473

Keyword

dead

Author

Gary W. Adamson, Aug 17 2008

Extensions

a(28) = 1 inserted by Georg Fischer, Aug 18 2023

Status

approved