cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A226065 Sum of all the smaller parts raised to their corresponding larger parts of the partitions of n into exactly two parts.

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%I A226065 #33 Nov 19 2021 17:48:04
%S A226065 0,1,1,5,9,44,114,564,1882,9665,39083,211025,993803,5686104,30342060,
%T A226065 184813048,1095555260,7118824417,46199135453,320295658577,
%U A226065 2250749112381,16626717667348,125452246988974,985178854556524
%N A226065 Sum of all the smaller parts raised to their corresponding larger parts of the partitions of n into exactly two parts.
%H A226065 G. C. Greubel, <a href="/A226065/b226065.txt">Table of n, a(n) for n = 1..500</a>
%H A226065 <a href="/index/Par#part">Index entries for sequences related to partitions</a>
%F A226065 a(n) = Sum_{i = 1..floor(n/2)} i^(n-i).
%e A226065 a(6) = 44; 6 has exactly 3 partitions into two parts: (5,1),(4,2),(3,3). Raising the smaller parts to their corresponding larger parts and adding the results, we get: 1^5 + 2^4 + 3^3 = 1 + 16 + 27 = 44.
%t A226065 Table[Sum[i^(n - i), {i, Floor[n/2]}], {n,50}] (* _G. C. Greubel_, Dec 13 2016 *)
%o A226065 (PARI) a(n)=sum(i=1,floor(n/2),i^(n-i)) \\ _Ralf Stephan_, May 27 2013
%Y A226065 Cf. A226140.
%K A226065 nonn,easy
%O A226065 1,4
%A A226065 _Wesley Ivan Hurt_, May 24 2013