Number of nX3 0..1 arrays with every element equal to 0, 1, 3, 4, 5 or 6 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
A301493
Number of nX3 0..1 arrays with every element equal to 0, 1, 3, 4, 5 or 6 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
Terms
- a(0) =3a(1) =2a(2) =5a(3) =15a(4) =45a(5) =156a(6) =479a(7) =1455a(8) =4493a(9) =14037a(10) =43495a(11) =134587a(12) =417047a(13) =1293362a(14) =4008799a(15) =12423540a(16) =38505876a(17) =119353345a(18) =369934949a(19) =1146596091a(20) =3553853570a(21) =11015153343a(22) =34141324269a(23) =105820474738a(24) =327989056256
External references
- oeis: A301493