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

A304600

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

Terms

    a(0) =8a(1) =9a(2) =23a(3) =73a(4) =179a(5) =515a(6) =1450a(7) =4024a(8) =11122a(9) =31092a(10) =86816a(11) =242134a(12) =674738a(13) =1881798a(14) =5248442a(15) =14637102a(16) =40816980a(17) =113827162a(18) =317437278a(19) =885253890a(20) =2468736666a(21) =6884654742a(22) =19199525352a(23) =53542506842a(24) =149316129526a(25) =416403812262

External references