login
A275396
Number of nX3 0..2 arrays with no element equal to any value at offset (-2,-1) (-2,0) or (-1,1) and new values introduced in order 0..2.
1
5, 54, 84, 178, 394, 1017, 2645, 6980, 18464, 48959, 129079, 340418, 895555, 2359728, 6219251, 16402499, 43261910, 114071354, 300754298, 792805040, 2090067487, 5510137826, 14527552687, 38302379482, 100983905166, 266240696535
OFFSET
1,1
COMMENTS
Column 3 of A275401.
LINKS
FORMULA
Empirical: a(n) = 3*a(n-1) +4*a(n-2) -19*a(n-3) +a(n-4) +65*a(n-5) -47*a(n-6) -99*a(n-7) +83*a(n-8) +66*a(n-9) -4*a(n-10) -60*a(n-11) -73*a(n-12) +36*a(n-13) +121*a(n-14) -88*a(n-15) +13*a(n-16) +8*a(n-17) -19*a(n-18) +20*a(n-19) -7*a(n-20) -a(n-21) +2*a(n-22) -a(n-23) +a(n-24) for n>28
EXAMPLE
Some solutions for n=4
..0..0..1. .0..0..0. .0..1..2. .0..1..1. .0..0..1. .0..0..0. .0..0..1
..2..0..1. .1..1..0. .0..0..0. .2..0..0. .2..0..0. .1..2..1. .2..0..0
..1..2..2. .2..1..1. .1..2..0. .1..2..2. .2..2..2. .1..2..1. .2..1..2
..0..1..2. .2..0..2. .1..1..1. .0..1..1. .0..1..1. .0..0..0. .0..1..2
CROSSREFS
Cf. A275401.
Sequence in context: A093674 A129664 A275499 * A275261 A208429 A275353
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jul 26 2016
STATUS
approved