A282186 Number of nX3 0..2 arrays with no element equal to more than four of its king-move neighbors, with the exception of exactly two elements, and with new values introduced in order 0 sequentially upwards.

0, 1, 44, 2919, 122866, 4446172, 148868304, 4745726158, 146320129628, 4402897631148, 130046855804440, 3785044372543552, 108853806605395072, 3099517720850200120, 87515890176533294512, 2453231879787924868752

Offset

1,3

Comments

Column 3 of A282189.

Links

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

Formula

Empirical: a(n) = 66*a(n-1) -1206*a(n-2) -98*a(n-3) +91188*a(n-4) +644760*a(n-5) -13676*a(n-6) -18240000*a(n-7) -85727400*a(n-8) -8070328*a(n-9) +1357158816*a(n-10) +5154540288*a(n-11) +1290662368*a(n-12) -49451487744*a(n-13) -162002765184*a(n-14) -69484923264*a(n-15) +914711301120*a(n-16) +2709412494336*a(n-17) +1765040047616*a(n-18) -7617338824704*a(n-19) -22456039010304*a(n-20) -22101688217600*a(n-21) +12644626710528*a(n-22) +69535600017408*a(n-23) +105600502628352*a(n-24) +95452790390784*a(n-25) +55231541673984*a(n-26) +20060850880512*a(n-27) +3837602562048*a(n-28) +351629475840*a(n-29) +12230590464*a(n-30) for n>33

Example

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

Crossrefs

Cf. A282189.

Sequence in context: A359885 A271137 A234833 * A200899 A220599 A304460

Adjacent sequences: A282183 A282184 A282185 * A282187 A282188 A282189

Keyword

nonn

Author

R. H. Hardin, Feb 08 2017

Status

approved