A275269 Number of 5Xn 0..2 arrays with no element equal to any value at offset (-2,-1) (-2,1) or (-1,-1) and new values introduced in order 0..2.

41, 172, 1440, 13156, 126420, 1224088, 11894712, 115625536, 1124255412, 10931650164, 106295619008, 1033583421020, 10050239175888, 97725359930112, 950250737426060, 9239940015430552, 89846278464312524, 873637029851887384

Offset

1,1

Comments

Row 5 of A275266.

Links

R. H. Hardin, Table of n, a(n) for n = 1..210

Formula

Empirical: a(n) = 11*a(n-1) -9*a(n-2) -45*a(n-3) +145*a(n-4) -295*a(n-5) +78*a(n-6) -438*a(n-7) +967*a(n-8) -1046*a(n-9) -1025*a(n-10) +1231*a(n-11) +225*a(n-12) +568*a(n-13) +55*a(n-14) +62*a(n-15) +6*a(n-16) -a(n-18) for n>19

Example

Some solutions for n=4
..0..1..0..2. .0..1..0..2. .0..1..1..1. .0..1..2..2. .0..1..0..0
..0..2..0..2. .1..1..0..1. .1..1..2..2. .2..2..0..1. .2..1..2..2
..0..2..0..2. .0..2..0..2. .2..2..2..0. .2..1..0..1. .2..1..2..1
..1..2..0..1. .0..2..0..2. .2..0..0..0. .0..1..0..1. .0..0..0..0
..0..2..1..2. .0..2..1..1. .0..0..1..1. .2..1..0..2. .0..1..2..1

Crossrefs

Cf. A275266.

Sequence in context: A142839 A142912 A158626 * A142310 A033228 A282941

Adjacent sequences: A275266 A275267 A275268 * A275270 A275271 A275272

Keyword

nonn

Author

R. H. Hardin, Jul 21 2016

Status

approved