Number of nX6 0..1 arrays with every element unequal to 0, 1, 3 or 4 king-move adjacent elements, with upper left element zero.

A303806

Number of nX6 0..1 arrays with every element unequal to 0, 1, 3 or 4 king-move adjacent elements, with upper left element zero.

Terms

    a(0) =13a(1) =61a(2) =47a(3) =107a(4) =174a(5) =316a(6) =597a(7) =1298a(8) =2799a(9) =6188a(10) =13927a(11) =32115a(12) =74576a(13) =176347a(14) =420893a(15) =1007545a(16) =2418100a(17) =5845990a(18) =14209105a(19) =34637540a(20) =84594326a(21) =207132363a(22) =508170970a(23) =1248839455a(24) =3073699411a(25) =7576337965a(26) =18694693560a(27) =46170243550a(28) =114117748186

External references