A269056 Number of 5Xn 0..2 arrays with some element plus some horizontally, diagonally or antidiagonally adjacent neighbor totalling two not more than once.

243, 2430, 17346, 183072, 1643376, 15547380, 140497512, 1273499256, 11354964888, 100764874440, 886829123676, 7765850889120, 67643548943508, 586749197487720, 5069733374448192, 43657996370224608, 374818434125094900

Offset

1,1

Comments

Row 5 of A269052.

Links

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

Formula

Empirical: a(n) = 12*a(n-1) +26*a(n-2) -566*a(n-3) -123*a(n-4) +8804*a(n-5) -4121*a(n-6) -59620*a(n-7) +55115*a(n-8) +183692*a(n-9) -256127*a(n-10) -211910*a(n-11) +498819*a(n-12) -48036*a(n-13) -371692*a(n-14) +214008*a(n-15) +43848*a(n-16) -64656*a(n-17) +8640*a(n-18) +5184*a(n-19) -1296*a(n-20) for n>22

Example

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

Crossrefs

Cf. A269052.

Sequence in context: A217968 A233158 A100627 * A209507 A226777 A016757

Adjacent sequences: A269053 A269054 A269055 * A269057 A269058 A269059

Keyword

nonn

Author

R. H. Hardin, Feb 18 2016

Status

approved