Number of nX4 0..1 arrays with every element unequal to 1, 2, 4, 5 or 6 king-move adjacent elements, with upper left element zero.

A304700

Number of nX4 0..1 arrays with every element unequal to 1, 2, 4, 5 or 6 king-move adjacent elements, with upper left element zero.

Terms

    a(0) =2a(1) =10a(2) =21a(3) =48a(4) =215a(5) =798a(6) =3055a(7) =9810a(8) =41744a(9) =159183a(10) =570536a(11) =2308616a(12) =8872579a(13) =33367632a(14) =131450744a(15) =506761978a(16) =1940496321a(17) =7558901654a(18) =29184688564a(19) =112473463039a(20) =436144732416

External references