OFFSET
1,1
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
Index entries for linear recurrences with constant coefficients, signature (5).
FORMULA
Empirical: a(n) = 5*a(n-1) for n>3.
Conjectures from Colin Barker, Jan 07 2019: (Start)
G.f.: x*(9 + 3*x + 16*x^2) / (1 - 5*x).
a(n) = 256*5^(n-3) for n>2.
(End)
EXAMPLE
Some solutions for n=4:
..7..1..9..8..4....5..8..9..3..4....5..1..2..3..4....7..1..2..3..4
.12.13..0..3..2....0.11..7..1..2....0.11..7.13..9....0.11.12..8.14
.10.11..5..6.14...10..6.12.13.14...10..6.12..8.14...10..6..5.13..9
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 10 2015
STATUS
approved