OFFSET
1,5
COMMENTS
Table starts
.0...1.....0.......0.........1...........0.............0..............1
.1...2.....4.......9........18..........41............84............176
.0...4.....4......22........65.........193...........628...........1905
.0...9....22.....112.......716........3100.........14871..........73900
.1..18....65.....716......6656.......48781........406871........3133028
.0..41...193....3100.....48781......580796.......7644038.......93971260
.0..84...628...14871....406871.....7644038.....159104356.....3198623964
.1.176..1905...73900...3133028....93971260....3198623964...100746278612
.0.369..5929..349328..24130345..1163775908...62394318265..3118543214377
.0.772.18406.1679736.189393503.14482108589.1226341881232.98267901838019
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..219
FORMULA
Empirical for column k:
k=1: a(n) = a(n-3)
k=2: a(n) = 2*a(n-1) +2*a(n-5) -2*a(n-6) +4*a(n-7) -a(n-10)
k=3: [order 15]
k=4: [order 18] for n>21
EXAMPLE
Some solutions for n=4 k=4
..1..6..7..4..9....1..2..3..4..9....5..2..3..4..9....1..2..7..4..9
.10.11..8..2..3...10..7..8.13.14...10..0..1.13.14....6.11.12.13..3
.15.16..0.14.19...15.16..0.18.19...11.16..6.18..8...15.16..0.14..8
.20.17..5.12.13...20.17..5..6.24...20.17.22.19..7...20.10..5.19.24
.21.22.23.24.18...21.22.23.11.12...21.15.23.24.12...21.22.23.17.18
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
R. H. Hardin, Nov 20 2015
STATUS
approved