A280358 - OEIS

A280358

Number of n X 3 0..2 arrays with no element equal to more than one of its horizontal and vertical neighbors and with new values introduced in order 0 sequentially upwards.

4, 50, 571, 6727, 78800, 924579, 10844773, 127214104, 1492251709, 17504551617, 205333329586, 2408618523801, 28253780677867, 331424891961162, 3887708335839063, 45603925604339175, 534947030615649624

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

COMMENTS

Column 3 of A280362.

LINKS

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

FORMULA

Empirical: a(n) = 10*a(n-1) +26*a(n-2) -58*a(n-3) -99*a(n-4) -63*a(n-5) -25*a(n-6) +229*a(n-7) -3*a(n-8) -16*a(n-9) +12*a(n-10) +16*a(n-12).

EXAMPLE

Some solutions for n=4

..0..1..1. .0..0..1. .0..1..0. .0..1..2. .0..1..2. .0..0..1. .0..1..2