Number of nX4 0..1 arrays with every element unequal to 1, 2, 3 or 6 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
A318426
Number of nX4 0..1 arrays with every element unequal to 1, 2, 3 or 6 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
Terms
- a(0) =2a(1) =50a(2) =147a(3) =889a(4) =3999a(5) =20016a(6) =95349a(7) =461349a(8) =2221254a(9) =10709861a(10) =51624399a(11) =248863408a(12) =1199637700a(13) =5783023852a(14) =27877251865a(15) =134385218809a(16) =647812913270
External references
- oeis: A318426