A226846 Number of nX2 (0,1,2) arrays of permanents of 2X2 subblocks of some (n+1)X3 binary array

9, 71, 417, 2291, 12961, 75111, 435829, 2516107, 14498679, 83596597, 482294269, 2782594803, 16052069059, 92596152241, 534149182269, 3081333299995, 17775212697869, 102539091355747, 591512212912103, 3412229156562681

Offset

1,1

Comments

Column 2 of A226852

Links

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

Formula

Empirical: a(n) = 6*a(n-1) -8*a(n-2) +29*a(n-3) +59*a(n-4) -27*a(n-5) +80*a(n-6) -237*a(n-7) -912*a(n-8) -793*a(n-9) -835*a(n-10) -285*a(n-11) +483*a(n-12) +635*a(n-13) +968*a(n-14) +721*a(n-15) +103*a(n-16) -233*a(n-17) -237*a(n-18) -72*a(n-19)

Example

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

Crossrefs

Sequence in context: A156705 A231419 A227848 * A226711 A231420 A081900

Adjacent sequences: A226843 A226844 A226845 * A226847 A226848 A226849

Keyword

nonn

Author

R. H. Hardin Jun 19 2013

Status

approved