Number of nX3 0..4 arrays with each element equal to the number its horizontal and vertical neighbors equal to 2.

A197056

Number of nX3 0..4 arrays with each element equal to the number its horizontal and vertical neighbors equal to 2.

Terms

    a(0) =1a(1) =3a(2) =6a(3) =10a(4) =14a(5) =22a(6) =38a(7) =67a(8) =111a(9) =179a(10) =291a(11) =485a(12) =812a(13) =1348a(14) =2220a(15) =3660a(16) =6060a(17) =10053a(18) =16653a(19) =27541a(20) =45541a(21) =75367a(22) =124786a(23) =206574a(24) =341850a(25) =565666a(26) =936146a(27) =1549447a(28) =2564507a(29) =4244263

External references