|
|
A281883
|
|
Number of n X 3 0..1 arrays with no element equal to more than four of its king-move neighbors, with the exception of exactly one element, and with new values introduced in order 0 sequentially upwards.
|
|
1
|
|
|
0, 0, 68, 638, 4832, 35002, 241209, 1612568, 10566034, 68136376, 433938423, 2736019588, 17108229189, 106234294380, 655764472080, 4027264205666, 24622851384305, 149957156910166, 910104036599313, 5506462499669112
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,3
|
|
COMMENTS
|
|
|
LINKS
|
|
|
FORMULA
|
Empirical: a(n) = 10*a(n-1) -17*a(n-2) -28*a(n-3) -122*a(n-4) +132*a(n-5) +368*a(n-6) +570*a(n-7) +171*a(n-8) -746*a(n-9) -979*a(n-10) -2038*a(n-11) -1625*a(n-12) -840*a(n-13) -784*a(n-14) for n>17.
|
|
EXAMPLE
|
Some solutions for n=4
..0..0..1. .0..1..1. .0..1..0. .0..0..0. .0..1..1. .0..0..0. .0..0..1
..0..1..1. .1..1..1. .0..0..1. .1..1..1. .1..1..0. .1..0..0. .1..0..1
..1..1..0. .0..0..1. .1..0..0. .1..1..0. .0..1..0. .1..1..0. .1..1..1
..1..1..1. .1..0..1. .1..1..0. .0..1..0. .1..1..1. .1..0..1. .1..0..1
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|