A127474 Triangle, square of A054522.

1, 2, 1, 3, 0, 4, 4, 3, 0, 4, 5, 0, 0, 0, 16, 6, 3, 8, 0, 0, 4, 7, 0, 0, 0, 0, 0, 36, 8, 7, 0, 12, 0, 0, 0, 16, 9, 0, 16, 0, 0, 0, 0, 0, 36, 10, 5, 0, 0, 32, 0, 0, 0, 0, 16

Offset

1,2

Comments

Right border = A127473, squares of phi(n) terms. Row sums = A057660: (1, 3, 7, 11, 21, ...).

Links

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

Formula

(A054522)^2 as an infinite lower triangular matrix.

Example

First few rows of the triangle:
  1;
  2, 1;
  3, 0, 4;
  4, 3, 0,  4;
  5, 0, 0,  0, 16;
  6, 3, 8,  0,  0, 4;
  7, 0, 0,  0,  0, 0, 36;
  8, 7, 0, 12,  0, 0,  0, 16;
  ...

Crossrefs

Cf. A127473, A057660, A054522.

Sequence in context: A070817 A231347 A180988 * A364015 A363158 A363259

Adjacent sequences: A127471 A127472 A127473 * A127475 A127476 A127477

Keyword

nonn,tabl

Author

Gary W. Adamson, Jan 15 2007

Status

approved