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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.

A368889 a(n) = Sum_{k=0..floor(n/2)} n^(3*k) * binomial(n-k,k).

Table of values

n a(n)
0 1
1 1
2 9
3 55
4 4289
5 47376
6 10358713
7 162592977
8 70065589761
9 1419907258279
10 1015035028009001
11 25173466118539344
12 26947505294538873409
13 790057195504021692521
14 1183327797361056503499225
15 40027334070963910087734751
16 79925496016112851520801796097

List of values

[1, 1, 9, 55, 4289, 47376, 10358713, 162592977, 70065589761, 1419907258279, 1015035028009001, 25173466118539344, 26947505294538873409, 790057195504021692521, 1183327797361056503499225, 40027334070963910087734751, 79925496016112851520801796097]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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