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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.

A337286 a(n) = Sum_{i=0..n} i^2*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 4
3 13
4 77
5 477
6 2241
7 10522
8 47386
9 204202
10 860302
11 3546623
12 14357567
13 57286271
14 225714755
15 879795380
16 3397426356
17 13012405492
18 49478890936
19 186932228945
20 702169068945
21 2623863676449
22 9758799153349
23 36140284390030
24 133317609306766
25 490032600916766
26 1795262239190210
27 6557012850772931

List of values

[0, 0, 4, 13, 77, 477, 2241, 10522, 47386, 204202, 860302, 3546623, 14357567, 57286271, 225714755, 879795380, 3397426356, 13012405492, 49478890936, 186932228945, 702169068945, 2623863676449, 9758799153349, 36140284390030, 133317609306766, 490032600916766, 1795262239190210, 6557012850772931]

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

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