Number of nX2 0..1 arrays with every element unequal to 2, 3 or 4 king-move adjacent elements, with upper left element zero.

A303684

Number of nX2 0..1 arrays with every element unequal to 2, 3 or 4 king-move adjacent elements, with upper left element zero.

Terms

    a(0) =0a(1) =3a(2) =5a(3) =18a(4) =61a(5) =209a(6) =702a(7) =2381a(8) =8069a(9) =27330a(10) =92581a(11) =313641a(12) =1062502a(13) =3599373a(14) =12193421a(15) =41307034a(16) =139933701a(17) =474046225a(18) =1605902110a(19) =5440232205a(20) =18429595637a(21) =62432996082a(22) =211501059173a(23) =716491292025

External references