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 (10).
FORMULA
Empirical: a(n) = 10*a(n-1) for n>4.
Conjectures from Colin Barker, Jan 05 2019: (Start)
G.f.: x*(8 + x - 90*x^2 - 144*x^3) / (1 - 10*x).
a(n) = 441*2^n * 5^(n-4) for n>3.
(End)
EXAMPLE
Some solutions for n=4:
..0.11..2..6...10.11..2..3....0.11..2..6....0..1..2..6...10..4..2..3
..1..5..3..7....4..8..6..7....1..5..3..7....4.15..3.10....1.15..6..7
.18..9.10.14...18.12..0..1....8.19.13.14....5.19..7.11...18..9..0.11
.12.16..4.15....9.16.14..5...12.10..4.18...12.13.17.18...12.13.17..5
.13.17..8.19...13.17.15.19...16.17.15..9...16.14..8..9...16.14..8.19
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 06 2015
STATUS
approved