Number of nX3 0..1 arrays with every element unequal to 0, 1, 3, 4 or 7 king-move adjacent elements, with upper left element zero.

A304850

Number of nX3 0..1 arrays with every element unequal to 0, 1, 3, 4 or 7 king-move adjacent elements, with upper left element zero.

Terms

    a(0) =3a(1) =7a(2) =9a(3) =15a(4) =29a(5) =51a(6) =91a(7) =177a(8) =363a(9) =739a(10) =1513a(11) =3143a(12) =6655a(13) =14303a(14) =31045a(15) =67793a(16) =148749a(17) =327891a(18) =725675a(19) =1610855a(20) =3583125a(21) =7981893a(22) =17801055a(23) =39736009a(24) =88762991a(25) =198384777a(26) =443558549a(27) =992011343a(28) =2219095455a(29) =4964860519

External references