A269211 Number of nX5 0..3 arrays with some element plus some horizontally, diagonally or antidiagonally adjacent neighbor totalling three exactly once.

432, 49536, 4744704, 394072704, 30541426560, 2267772823680, 163535201141376, 11544796423498368, 801929439109544064, 54999867607734747264, 3733606080456064161408, 251316480848067823807104

Offset: 1

Author

R. H. Hardin, Feb 20 2016

Keywords

• nonn

Comments

Column 5 of A269214.

Examples

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

Links

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

Crossrefs

Cf. A269214.

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