OFFSET
1,1
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 43*a(n-1) - 43*a(n-3) + a(n-4).
Empirical g.f.: x*(676 - 143*x - 550*x^2 + 13*x^3) / ((1 - x)*(1 + x)*(1 - 43*x + x^2)). - Colin Barker, Jan 07 2019
EXAMPLE
Some solutions for n=2:
..8..2..1..3..4..5....0..2..1..4..3..5....0..9..2..4..3..5....0..1.10..3..5..4
..6..7..0.17.11.10...14.15..7.10..9.11....6..8..7..1.11.10....7..6..9..8..2.11
.12.14.13.16.15..9...12.13..6.16..8.17...12.13.14.16.15.17...12.14.13.15.17.16
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 11 2015
STATUS
approved