A280855 - OEIS

A280855

Number of nX4 0..2 arrays with no element equal to more than one of its king-move neighbors and with new values introduced in order 0 sequentially upwards.

11, 110, 96, 124, 216, 462, 1005, 2010, 3907, 7756, 15749, 31804, 63463, 126758, 254453, 511180, 1024877, 2052836, 4115191, 8254198, 16552251, 33182160, 66522097, 133381078, 267442273, 536212952, 1075064777, 2155474072, 4321733703

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OFFSET

1,1

COMMENTS

Column 4 of A280859.

LINKS

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

FORMULA

Empirical: a(n) = a(n-1) +a(n-2) +a(n-3) +2*a(n-4) +3*a(n-5) -4*a(n-6) -3*a(n-7) -4*a(n-10) +2*a(n-12) for n>16

EXAMPLE

Some solutions for n=4

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