Number of nX4 0..1 arrays with every element unequal to 0, 1, 3, 4 or 5 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

A326161

Number of nX4 0..1 arrays with every element unequal to 0, 1, 3, 4 or 5 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

Terms

    a(0) =5a(1) =11a(2) =25a(3) =85a(4) =261a(5) =838a(6) =2644a(7) =8646a(8) =28076a(9) =91588a(10) =300287a(11) =985329a(12) =3236906a(13) =10639958a(14) =34985229a(15) =115030534a(16) =378227748a(17) =1243694242a(18) =4089598628a(19) =13448040812a(20) =44222592709a(21) =145423018099a(22) =478214308106

External references