A198070 a(n) = round((n+1/n)^5).
32, 98, 412, 1387, 3802, 8918, 18593, 35409, 62785, 105101, 167817, 257593, 382409, 551685, 776401, 1069217, 1444593, 1918909, 2510585, 3240201, 4130616, 5207092, 6497408, 8031984, 9844000, 11969516, 14447592, 17320408
Offset: 1
Links
- Vincenzo Librandi, Table of n, a(n) for n = 1..10000
- Index entries for linear recurrences with constant coefficients, signature (6,-15,20,-15,6,-1).
Programs
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Magma
[Round((n+1/n)^5): n in [1..60]];
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PARI
a(n)=round((n+1/n)^5) \\ Charles R Greathouse IV, Oct 27 2011
Formula
a(n) = n*(n^4+5*n^2+10) = A197904(n)-1 for n>20. - Bruno Berselli, Oct 27 2011