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A227022 Number of nX3 (0,1,2) arrays of permanents of 2X2 subblocks of some (n+1)X4 binary array with rows and columns of the latter in lexicographically nondecreasing order 1
12, 72, 335, 1366, 4948, 16115, 47659, 129463, 326522, 771653, 1722005, 3652726, 7406710, 14426468, 27103102, 49288384, 87029344, 149600861, 250930856, 411535151, 661105246, 1041922558, 1613307461, 2457351181, 3686223670 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A227025

LINKS

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

FORMULA

Empirical: a(n) = (1/2217600)*n^11 + (1/48384)*n^10 + (19/241920)*n^9 + (199/2800)*n^7 - (4291/11520)*n^6 - (3567/1792)*n^5 + (1336261/24192)*n^4 - (95295341/302400)*n^3 + (851237/1440)*n^2 + (8658337/9240)*n - 3550 for n>6

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Sequence in context: A118979 A014970 A236967 * A036392 A035472 A036398

Adjacent sequences:  A227019 A227020 A227021 * A227023 A227024 A227025

KEYWORD

nonn

AUTHOR

R. H. Hardin Jun 27 2013

STATUS

approved

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Last modified June 19 12:52 EDT 2021. Contains 345129 sequences. (Running on oeis4.)