Number of n X 3 0..2 arrays with no element equal to any value at offset (-1,-2) (-2,-1) (0,-1) or (-1,0) and new values introduced in order 0..2.
A274798
Number of n X 3 0..2 arrays with no element equal to any value at offset (-1,-2) (-2,-1) (0,-1) or (-1,0) and new values introduced in order 0..2.
Terms
- a(0) =2a(1) =8a(2) =30a(3) =112a(4) =420a(5) =1572a(6) =5888a(7) =22048a(8) =82568a(9) =309200a(10) =1157904a(11) =4336144a(12) =16238112a(13) =60808896a(14) =227718752a(15) =852767104a(16) =3193464512a(17) =11958969152a(18) =44784259584a(19) =167709263104a(20) =628042022016
External references
- oeis: A274798