Number of nX4 0..1 arrays with every element unequal to 0, 1, 2 or 5 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

A318071

Number of nX4 0..1 arrays with every element unequal to 0, 1, 2 or 5 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

Terms

    a(0) =8a(1) =20a(2) =41a(3) =73a(4) =149a(5) =372a(6) =861a(7) =2016a(8) =4901a(9) =11698a(10) =27986a(11) =67359a(12) =161518a(13) =387556a(14) =930666a(15) =2233451a(16) =5360842a(17) =12868595a(18) =30887501a(19) =74139733a(20) =177960357a(21) =427157604a(22) =1025312853a(23) =2461074852a(24) =5907342192a(25) =14179472548a(26) =34035173339a(27) =81695041734

External references