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

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

Offset

1,3

Comments

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

Links

Table of n, a(n) for n=1..10.

Example

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.

Sequence in context: A002824 A259336 A308134 * A330764 A367487 A277355

Adjacent sequences: A160704 A160705 A160706 * A160708 A160709 A160710

Keyword

nonn,less

Author

Gary W. Adamson, May 24 2009

Status

approved