Number of nX4 0..4 arrays with each element equal to the number its horizontal and vertical neighbors equal to itself.

A195965

Number of nX4 0..4 arrays with each element equal to the number its horizontal and vertical neighbors equal to itself.

Terms

    a(0) =1a(1) =1a(2) =7a(3) =21a(4) =48a(5) =118a(6) =222a(7) =527a(8) =1370a(9) =3336a(10) =7717a(11) =17897a(12) =41296a(13) =98631a(14) =236602a(15) =554717a(16) =1304489a(17) =3078621a(18) =7242849a(19) =17138388a(20) =40496052a(21) =95320672a(22) =224944921a(23) =530817100a(24) =1251705990a(25) =2954749967a(26) =6970501275a(27) =16438448824a(28) =38788768683a(29) =91508873268

External references