Number of zero-sum nX1 -3..3 arrays with every element equal to at least one horizontal or vertical neighbor.

A202130

Number of zero-sum nX1 -3..3 arrays with every element equal to at least one horizontal or vertical neighbor.

Terms

    a(0) =0a(1) =1a(2) =1a(3) =7a(4) =5a(5) =43a(6) =43a(7) =275a(8) =371a(9) =1913a(10) =3017a(11) =14305a(12) =25039a(13) =109803a(14) =212645a(15) =866361a(16) =1818147a(17) =6992905a(18) =15653093a(19) =57383555a(20) =135498383a(21) =477220531a(22) =1177254905a(23) =4012238901a(24) =10256656225a(25) =34031432595a(26) =89553075529a(27) =290731277941

External references