A269198 Number of n X 5 0..3 arrays with some element plus some horizontally, diagonally or antidiagonally adjacent neighbor totalling three no more than once.

756, 68052, 5877228, 463790340, 34838403756, 2532677348772, 179867149105740, 12551707872624132, 864008559706781292, 58827234014669683044, 3969574872302454754188, 265864675607662372035012

Offset: 1

Author

R. H. Hardin, Feb 20 2016

Keywords

• nonn

Comments

Column 5 of A269201.

Examples

			Some solutions for n=2
..1..0..1..1..1. .0..1..0..2..2. .0..1..1..1..2. .2..0..1..1..0
..0..0..1..0..0. .3..1..1..0..0. .0..0..0..0..1. .2..3..3..1..0
		

Links

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

Crossrefs

Cf. A269201.

Formula

Empirical: a(n) = 156*a(n-1) -8170*a(n-2) +166732*a(n-3) -1381249*a(n-4) +2520764*a(n-5) [phone]*a(n-6) -130579860*a(n-7) [phone]*a(n-8) [phone]*a(n-9) -2425054036*a(n-10) [phone]*a(n-11) -2082954096*a(n-12) -207585696*a(n-13) [phone]*a(n-14) -335167488*a(n-15) -34112320*a(n-16) [phone]*a(n-17) -8385024*a(n-18) +497664*a(n-19) -9216*a(n-20) for n>21.