A208486 - OEIS

A208486

Number of (n+1) X 3 0..3 arrays with the number of clockwise edge increases in every 2 X 2 subblock equal to the number of counterclockwise edge increases.

1448, 33416, 773288, 17903016, 414522184, 9597910280, 222232271912, 5145622169576, 119143055140232, 2758668946684232, 63874930914742632, 1478976595260586280, 34244604867749825992, 792908397874578443656

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OFFSET

1,1

COMMENTS

Column 2 of A208492.

LINKS

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

FORMULA

Empirical: a(n) = 32*a(n-1) - 227*a(n-2) + 528*a(n-3) - 328*a(n-4) - 104*a(n-5).

Empirical g.f.: 8*x*(181 - 1615*x + 4084*x^2 - 2664*x^3 - 832*x^4) / (1 - 32*x + 227*x^2 - 528*x^3 + 328*x^4 + 104*x^5). - Colin Barker, Jul 03 2018

EXAMPLE

Some solutions for n=4: