Number of nX4 0..1 arrays with every element unequal to 0, 1, 2 or 4 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
A318020
Number of nX4 0..1 arrays with every element unequal to 0, 1, 2 or 4 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
Terms
- a(0) =8a(1) =35a(2) =133a(3) =569a(4) =2227a(5) =9063a(6) =37030a(7) =153117a(8) =634563a(9) =2638225a(10) =10982346a(11) =45752446a(12) =190717173a(13) =795215367a(14) =3316427798a(15) =13832535622a(16) =57698440650a(17) =240682257990
External references
- oeis: A318020