OFFSET
1,1
COMMENTS
Table starts
322 1730 8738 47306 239890 1308890 6664130
1730 7154 28170 127586 546362 2630882 11903466
8738 28170 87698 334938 1224482 5236698 21220178
47306 127586 334938 1108418 3530906 13445762 48741018
239890 546362 1224482 3530906 9883666 33745850 110368418
1308890 2630882 5236698 13445762 33745850 104373122 311077338
6664130 11903466 21220178 48741018 110368418 311077338 850224914
36647114 59901074 98011242 204403250 422926922 1093447730 2760580074
187332082 281693210 425712578 809806586 1539486130 3669275930 8598808130
1038190010 1465393634 2079662490 3649630466 6426536762 14155021442
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..127
FORMULA
Empirical for column k (the k=3..4 recurrence works also for k=1..2; apparently all rows and columns satisfy the same order 36 recurrence):
k=1: [linear recurrence of order 7].
k=2: [order 31].
k=3: [order 36].
k=4: [same order 36].
EXAMPLE
Some solutions for n=3, k=4:
0 7 7 0 0 2 4 2 7 3 0 4 4 4 0 4 0 3 2 6
6 7 1 0 6 5 1 5 4 6 2 0 6 0 2 3 5 2 7 5
6 1 1 6 6 1 3 1 6 2 0 4 4 4 0 4 0 3 2 6
0 1 7 6 0 6 2 6 5 7 2 0 6 0 2 3 5 2 7 5
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
R. H. Hardin, Dec 29 2013
STATUS
approved