

A210102


Number of (n+1) X 4 0..2 arrays with every 2 X 2 subblock having one or three distinct values, and new values 0..2 introduced in row major order.


1



135, 1690, 20687, 254314, 3125615, 38420586, 472285295, 5805666474, 71367850223, 877312746218, 10784669050991, 132574332967466, 1629716962468079, 20033875365546602, 246273549489277551, 3027405397881918378
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OFFSET

1,1


LINKS



FORMULA

Empirical: a(n) = 17*a(n1) 46*a(n2) 190*a(n3) +523*a(n4) +341*a(n5) 1220*a(n6) +184*a(n7) +488*a(n8) 96*a(n9).


EXAMPLE

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


CROSSREFS



KEYWORD

nonn


AUTHOR



STATUS

approved



