A160707 Convolution square root of the Robbins sequence, A005130, starting with offset 1.

1, 1, 3, 18, 192, 3472, 104964, 5306272, 450215638, 64298445920

Offset: 1

Author

Gary W. Adamson, May 24 2009

Keywords

• nonn
• less

Comments

Terms are not integral beyond what's shown! - Joerg Arndt, Jan 02 2019

Examples

			Self-convolution = the Robbins sequence, A005130: (1, 2, 7, 42, 429, 7436, ...).
Example: A005130(4) = 42 = (1, 1, 3, 18) dot (18, 3, 1, 1) = (18 + 3 + 3 + 18).
The reversed procedure given (1, 2, 7, 42, ...) for a(4) = 18 = (1/2) * (42 - 2*a(3)) = (1/2) * 36 = 18.
		

Crossrefs

Cf. A005130, A160708.