Number of nX4 0..1 arrays with every element unequal to 2, 3 or 6 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

A317898

Number of nX4 0..1 arrays with every element unequal to 2, 3 or 6 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

Terms

    a(0) =0a(1) =2a(2) =3a(3) =13a(4) =31a(5) =54a(6) =116a(7) =342a(8) =956a(9) =2459a(10) =6366a(11) =16404a(12) =42964a(13) =112558a(14) =294354a(15) =768840a(16) =2007738a(17) =5246415a(18) =13708041a(19) =35818742a(20) =93591255a(21) =244546559a(22) =638982739a(23) =1669591197a(24) =4362471879a(25) =11398715036a(26) =29783832169a(27) =77822515690a(28) =203343065801

External references