OFFSET
1,2
COMMENTS
Column 3 of A264569.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 2*a(n-1) +a(n-2) +6*a(n-3) -6*a(n-4) +6*a(n-5) -27*a(n-6) +5*a(n-7) -9*a(n-8) +33*a(n-9) -4*a(n-10) +7*a(n-11) -12*a(n-12) +a(n-13) -a(n-14) +a(n-15)
EXAMPLE
Some solutions for n=4
..1..4..3..6....1..4..3..6....1..4..3..6....1..2..5..6....1..2..5..6
..5..0..7..2....5..0..2.10....5..0..7..2....0..8..7..3....0..8..7..3
..9.12.13.14....9.12.13..7....9.10.11.14....9..4.11.14....9..4.11.14
..8.16.10.11....8.16.15.11....8.16.17.18...13.16.17.10...13.16.10.18
.17.18.19.15...17.18.19.14...12.13.19.15...12.18.19.15...17.12.19.15
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 17 2015
STATUS
approved