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 A227025 T(n,k)=Number of nXk (0,1,2) arrays of permanents of 2X2 subblocks of some (n+1)X(k+1) binary array with rows and columns of the latter in lexicographically nondecreasing order 6

%I

%S 3,7,7,12,26,12,18,72,72,18,25,171,335,171,25,33,368,1366,1366,368,33,

%T 42,729,4948,10050,4948,729,42,52,1343,16115,65317,65317,16115,1343,

%U 52,63,2325,47659,375270,786154,375270,47659,2325,63,75,3819,129463,1924848

%N T(n,k)=Number of nXk (0,1,2) arrays of permanents of 2X2 subblocks of some (n+1)X(k+1) binary array with rows and columns of the latter in lexicographically nondecreasing order

%C Table starts

%C ..3....7.....12.......18.........25...........33............42............52

%C ..7...26.....72......171........368..........729..........1343..........2325

%C .12...72....335.....1366.......4948........16115.........47659........129463

%C .18..171...1366....10050......65317.......375270.......1924848.......8908719

%C .25..368...4948....65317.....786154......8379285......79224749.....668706345

%C .33..729..16115...375270....8379285....168973605....3034194621...48518491730

%C .42.1343..47659..1924848...79224749...3034194621..104606988712.3220901001021

%C .52.2325.129463..8908719..668706345..48518491730.3220901001021

%C .63.3819.326522.37616613.5081503151.694140800875

%H R. H. Hardin, <a href="/A227025/b227025.txt">Table of n, a(n) for n = 1..112</a>

%F Empirical for column k:

%F k=1: a(n) = (1/2)*n^2 + (5/2)*n

%F k=2: [polynomial of degree 5] for n>2

%F k=3: [polynomial of degree 11] for n>6

%e Some solutions for n=4 k=4

%e ..0..0..0..2....0..0..1..1....1..0..0..0....0..0..1..1....0..0..1..0

%e ..0..0..1..1....1..0..1..1....0..0..0..0....0..2..1..1....0..1..0..0

%e ..1..0..1..1....1..0..1..1....1..1..0..1....0..2..2..1....2..0..0..1

%e ..0..0..1..0....2..2..2..1....2..1..0..1....1..2..1..0....2..0..0..1

%Y Column 1 is A027379

%K nonn,tabl

%O 1,1

%A _R. H. Hardin_ Jun 27 2013

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Last modified June 15 15:16 EDT 2021. Contains 345049 sequences. (Running on oeis4.)