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%I #4 Apr 17 2018 13:20:56
%S 5,21,28,74,197,544,1686,5252,16336,52895,174633,585706,2005396,
%T 6966921,24490114,86986183,311425171,1121853996,4061084204,
%U 14755768611,53766216246,196333300490,718099046548,2629697794146,9638889966861
%N Number of nX4 0..1 arrays with every element equal to 0, 1, 3, 4 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.
%C Column 4 of A303040.
%H R. H. Hardin, <a href="/A303036/b303036.txt">Table of n, a(n) for n = 1..210</a>
%F Empirical: a(n) = 5*a(n-1) -4*a(n-2) +17*a(n-3) -73*a(n-4) -27*a(n-5) -86*a(n-6) +412*a(n-7) +715*a(n-8) +717*a(n-9) -678*a(n-10) -2990*a(n-11) -4820*a(n-12) -4520*a(n-13) -1759*a(n-14) +2115*a(n-15) +10728*a(n-16) +26758*a(n-17) +47806*a(n-18) +55437*a(n-19) +28104*a(n-20) -39265*a(n-21) -114473*a(n-22) -130982*a(n-23) -83874*a(n-24) -24037*a(n-25) -59472*a(n-26) -179450*a(n-27) -261480*a(n-28) -146144*a(n-29) +102190*a(n-30) +239624*a(n-31) +64037*a(n-32) -296364*a(n-33) -461631*a(n-34) -174575*a(n-35) +392211*a(n-36) +747124*a(n-37) +685309*a(n-38) +266070*a(n-39) -93667*a(n-40) -163661*a(n-41) -10697*a(n-42) +100455*a(n-43) +76977*a(n-44) -44571*a(n-45) -130982*a(n-46) -137118*a(n-47) -73015*a(n-48) -9401*a(n-49) +21851*a(n-50) +21527*a(n-51) -1519*a(n-52) -8400*a(n-53) -687*a(n-54) -302*a(n-55) +1732*a(n-56) +4267*a(n-57) +3151*a(n-58) +551*a(n-59) -1037*a(n-60) -1149*a(n-61) -351*a(n-62) +325*a(n-63) +201*a(n-64) -52*a(n-65) -62*a(n-66) +4*a(n-67) +13*a(n-68) -a(n-70)
%e Some solutions for n=5
%e ..0..0..0..1. .0..1..0..1. .0..1..0..1. .0..1..0..1. .0..1..0..1
%e ..0..1..0..1. .0..1..0..1. .1..1..0..1. .0..1..0..1. .0..1..0..1
%e ..0..1..1..1. .0..1..0..1. .0..1..0..1. .0..1..0..0. .0..1..0..1
%e ..0..1..0..1. .0..1..0..0. .0..1..0..1. .0..1..0..1. .0..1..1..1
%e ..0..1..0..1. .0..1..0..1. .0..1..1..1. .0..1..1..1. .0..1..0..1
%Y Cf. A303040.
%K nonn
%O 1,1
%A _R. H. Hardin_, Apr 17 2018
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