A118911 Row sums of triangle in A128973.

1, 1, 3, 3, 3, 3, 5, 5, 3, 3, 9, 9, 5, 5, 11, 11, 3, 3, 9, 9, 9, 9, 15, 15, 5, 5, 15, 15, 11, 11, 21, 21, 3, 3, 9, 9, 9, 9, 15, 15, 9, 9, 27, 27, 15, 15, 33, 33, 5, 5, 15, 15, 15, 15, 25, 25, 11, 11, 33, 33, 21, 21, 43, 43, 3, 3, 9, 9, 9, 9, 15, 15, 9, 9, 27, 27, 15, 15, 33, 33, 9, 9

Offset

0,3

Comments

Integers in A071053 repeated.

Links

Table of n, a(n) for n=0..81.

Formula

a(2*n) = a(2*n+1).

a(n) = Sum_{k=0..n} A128973(n,k).

a(2^k+m) = 3*a(m) for 0 <= m <= 2^(k-1) - 1, k >= 1.

a(4*n) = a(2*n) = A071053(n).

Crossrefs

Cf. A071053, A128973.

Sequence in context: A125713 A332323 A162220 * A190268 A111756 A130821

Adjacent sequences: A118908 A118909 A118910 * A118912 A118913 A118914

Keyword

nonn

Author

Philippe Deléham, May 02 2007, Jan 06 2008

Extensions

a(48) and following terms corrected by Georg Fischer, Jul 04 2023

Status

approved