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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.

A337283 a(n) = Sum_{i=0..n} i*T(i)^2, where T(i) = A000073(i) is the i-th tribonacci number.

Table of values

n a(n)
0 0
1 0
2 2
3 5
4 21
5 101
6 395
7 1578
8 6186
9 23610
10 89220
11 333431
12 1234343
13 4536551
14 16567157
15 60172532
16 217524468
17 783111476
18 2809027334
19 10043413545
20 35805255545
21 127314522569
22 451629771519
23 1598650868766
24 5647706073630
25 19916305738030
26 70117445671624
27 246478579433947
28 865201260035147

List of values

[0, 0, 2, 5, 21, 101, 395, 1578, 6186, 23610, 89220, 333431, 1234343, 4536551, 16567157, 60172532, 217524468, 783111476, 2809027334, 10043413545, 35805255545, 127314522569, 451629771519, 1598650868766, 5647706073630, 19916305738030, 70117445671624, 246478579433947, 865201260035147]

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

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