a(n) = B(n+3) - 6*B(n+2) + 8*B(n+1)*B(n+1) - B(n), where the B(i) are Bell numbers (A000110).
A225591
a(n) = B(n+3) - 6*B(n+2) + 8*B(n+1)*B(n+1) - B(n), where the B(i) are Bell numbers (A000110).
Terms
- a(0) =0a(1) =16a(2) =160a(3) =1686a(4) =21276a(5) =328498a(6) =6149136a(7) =137105016a(8) =3577543452a(9) =107601726030
External references
- oeis: A225591