A274725 Number of nX5 0..2 arrays with no element equal to any value at offset (-1,-2) (-2,-1) or (-1,0) and new values introduced in order 0..2.

41, 384, 1300, 10368, 84948, 687248, 5634776, 45990340, 375845052, 3070055916, 25083639844, 204917982144, 1674151403908, 13677241018800, 111739565720152, 912879351011812, 7457971359536024, 60929501956856368, 497776886832382136

Offset

1,1

Comments

Column 5 of A274728.

Links

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

Formula

Empirical: a(n) = 3*a(n-1) +33*a(n-2) +66*a(n-3) +94*a(n-4) -115*a(n-5) -155*a(n-6) -255*a(n-7) +236*a(n-8) +152*a(n-9) +61*a(n-10) -213*a(n-11) +90*a(n-12) -5*a(n-13) +13*a(n-14) -4*a(n-15) for n>19

Example

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

Crossrefs

Cf. A274728.

Sequence in context: A297586 A196576 A090211 * A250143 A069594 A124338

Adjacent sequences: A274722 A274723 A274724 * A274726 A274727 A274728

Keyword

nonn

Author

R. H. Hardin, Jul 03 2016

Status

approved