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A218376 a(n) = 5^n*sum_{i=1..n} i^5/5^i. 1

%I #17 Nov 29 2012 18:49:58

%S 0,1,37,428,3164,18945,102501,529312,2679328,13455689,67378445,

%T 337053276,1685515212,8427947353,42140274589,210702132320,

%U 1053511710176,5267559970737,26337801743253,131689011192364,658445059161820

%N a(n) = 5^n*sum_{i=1..n} i^5/5^i.

%F From _Peter Bala_, Nov 29 2012: (Start)

%F a(n) = 1/512*(3535*5^n - (128*n^5 + 800*n^4 + 2400*n^3 + 4600*n^2 + 5700*n + 3535)).

%F Recurrence equation: a(n) = 5*a(n-1) + n^5.

%F G.f.: (x + 26*x^2 + 66*x^3 + 26*x^4 + x^5)/((1 - 5*x)*(1 - x)^6) = x + 37*x^2 + 428*x^3 + ....

%F (End)

%t f[n_] := 5^n*Sum[i^5/5^i, {i, n}]; Array[f, 30, 0]

%Y Cf. A000217, A047520, A066999, A067534. A008292.

%K easy,nonn

%O 0,3

%A _Robert G. Wilson v_, Nov 28 2012

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Last modified March 28 05:39 EDT 2024. Contains 371235 sequences. (Running on oeis4.)