Number of nX3 0..4 arrays with each element equal to the number its horizontal and vertical neighbors unequal to itself.

A195957

Number of nX3 0..4 arrays with each element equal to the number its horizontal and vertical neighbors unequal to itself.

Terms

    a(0) =2a(1) =6a(2) =10a(3) =16a(4) =21a(5) =44a(6) =82a(7) =144a(8) =273a(9) =531a(10) =1032a(11) =1960a(12) =3805a(13) =7446a(14) =14505a(15) =28254a(16) =55311a(17) =108511a(18) =212645a(19) =417039a(20) =819145a(21) =1609692a(22) =3163058a(23) =6217976a(24) =12229218a(25) =24055201a(26) =47320658a(27) =93104592a(28) =183213156a(29) =360551489

External references