Number of nX4 0..1 arrays with every element equal to 1, 2, 3 or 6 king-move adjacent elements, with upper left element zero.
A297989
Number of nX4 0..1 arrays with every element equal to 1, 2, 3 or 6 king-move adjacent elements, with upper left element zero.
Terms
- a(0) =2a(1) =49a(2) =146a(3) =466a(4) =1446a(5) =4648a(6) =14888a(7) =47399a(8) =150849a(9) =480015a(10) =1528351a(11) =4868127a(12) =15504952a(13) =49377480a(14) =157242432a(15) =500744003a(16) =1594669951a(17) =5078421202a(18) =16172807093a(19) =51503968299a(20) =164019559229a(21) =522337092408
External references
- oeis: A297989