a(n) = n*x^n + (n-1)*x^(n-1) + . . . + x + 1 for x=5.
A277975
a(n) = n*x^n + (n-1)*x^(n-1) + . . . + x + 1 for x=5.
Terms
- a(0) =1a(1) =6a(2) =56a(3) =431a(4) =2931a(5) =18556a(6) =112306a(7) =659181a(8) =3784181a(9) =21362306a(10) =119018556a(11) =656127931a(12) =3585815431a(13) =19454956056a(14) =104904174806a(15) =562667846681
External references
- oeis: A277975