A270056 Number of nX6 0..4 arrays with some element plus some horizontally or vertically adjacent neighbor totalling four exactly once.

6400, 26891280, 64599504300, 130850370606120, 243724207420143600, 431802177781617762960, 739963061540157663852060, 1238271081977141318093293560, 2035565501104551915702385538340

Offset

1,1

Comments

Column 6 of A270058.

Links

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

Formula

Empirical: a(n) = 3820*a(n-1) -5141812*a(n-2) +3101631176*a(n-3) -1053325179812*a(n-4) +225930415991302*a(n-5) -32465460013961126*a(n-6) +3207851298752368554*a(n-7) -217580289808005247320*a(n-8) +9706372592807726300356*a(n-9) -240860672010312397879341*a(n-10) +115473715969373609881354*a(n-11) +212020581493432030950883197*a(n-12) -6862246606169040312770752410*a(n-13) +69977373438286287807082579927*a(n-14) +1240079187008116763603015457992*a(n-15) -46282001268519984080947125145024*a(n-16) +500401562102338128223713704959392*a(n-17) +318529972429762141211745078727216*a(n-18) -59633160184685032320235324860614016*a(n-19) +541188478996193175160548803121462848*a(n-20) -795703540248872440476678397698018432*a(n-21) -18690496956959404408797298248907914816*a(n-22) +150522035368938828426070273182800557568*a(n-23) -511422590153363523124456598370318521344*a(n-24) +826346567199579029883524578636954353664*a(n-25) -514087593143152142368253004618643603456*a(n-26) for n>27

Example

Some solutions for n=1
..4..2..4..0..0..3. .2..3..2..1..3..3. .4..1..2..2..0..0. .1..2..0..4..2..3

Crossrefs

Cf. A270058.

Sequence in context: A251454 A237954 A269827 * A031578 A252612 A259060

Adjacent sequences: A270053 A270054 A270055 * A270057 A270058 A270059

Keyword

nonn

Author

R. H. Hardin, Mar 09 2016

Status

approved