A225586 Floor((5^n-1)/n).

4, 12, 41, 156, 624, 2604, 11160, 48828, 217013, 976562, 4438920, 20345052, 93900240, 435965401, 2034505208, 9536743164, 44878791360, 211927625868, 1003867701480, 4768371582031, 22706531343005, 108372081409801, 518301258916440, 2483526865641276

Offset: 1

Author

Vincenzo Librandi, May 30 2013

Keywords

• nonn
• easy

Links

• Vincenzo Librandi, Table of n, a(n) for n = 1..300

Crossrefs

Cf. A024049, A034474, A082482, A129795.

Programs

Magma

[Floor((5^n-1)/n): n in [1..30]];

Mathematica

Table[Floor[(5^n - 1) / n], {n, 30}] (* or *) Table[Quotient[5^n - 1, n], {n, 30}]