OFFSET
1,1
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = a(n-1) + 7*a(n-2) + 23*a(n-3) + 35*a(n-4) + 18*a(n-5) for n>7.
Empirical g.f.: x*(4 + 21*x + 45*x^2 + 53*x^3 + 43*x^4 + 18*x^5 + 4*x^6) / (1 - x - 7*x^2 - 23*x^3 - 35*x^4 - 18*x^5). - Colin Barker, Jan 05 2019
EXAMPLE
Some solutions for n=4:
..5..1..2....5..8..1....5..0..1....7..0..1....0..8..1....7..0..1....5..0..1
..0..3..4....0..3..2....3..4..2....3.11..2...10..3..2....3..4..2....8..4..2
.11..6..8....6..4..7....6..7..8....6..4..5...13..4..5...13..6..5....3.14..7
.14..7.10...14.10.11...14..9.10...14..9..8....6..7.11...14..9..8....6..9.10
..9.12.13....9.12.13...12.13.11...12.10.13....9.12.14...12.10.11...12.13.11
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 06 2015
STATUS
approved