Number of nX4 0..1 arrays with every element unequal to 2, 3 or 5 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
A317867
Number of nX4 0..1 arrays with every element unequal to 2, 3 or 5 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
Terms
- a(0) =0a(1) =2a(2) =6a(3) =26a(4) =88a(5) =301a(6) =1089a(7) =4340a(8) =16696a(9) =64514a(10) =247718a(11) =951489a(12) =3664952a(13) =14093271a(14) =54262682a(15) =208711489a(16) =803269846a(17) =3090437571a(18) =11892612119a(19) =45759331536a(20) =176080105486a(21) =677526781675
External references
- oeis: A317867