Number of nX4 0..1 arrays with every element equal to 0, 1, 3, 4 or 5 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
A300884
Number of nX4 0..1 arrays with every element equal to 0, 1, 3, 4 or 5 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
Terms
- a(0) =5a(1) =3a(2) =8a(3) =40a(4) =121a(5) =465a(6) =1822a(7) =7045a(8) =27552a(9) =107582a(10) =418774a(11) =1634134a(12) =6372604a(13) =24848456a(14) =96907225a(15) =377944318a(16) =1473935615a(17) =5748325489a(18) =22418429589a(19) =87431292466a(20) =340980199614
External references
- oeis: A300884