a(n) = 6*a(n-1) - 6*a(n-2) for n > 1; a(0) = 4, a(1) = 15.
A164310
a(n) = 6*a(n-1) - 6*a(n-2) for n > 1; a(0) = 4, a(1) = 15.
Terms
- a(0) =4a(1) =15a(2) =66a(3) =306a(4) =1440a(5) =6804a(6) =32184a(7) =152280a(8) =720576a(9) =3409776a(10) =16135200a(11) =76352544a(12) =361304064a(13) =1709709120a(14) =8090430336a(15) =38284327296a(16) =181163381760a(17) =857274326784
External references
- oeis: A164310