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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.

A337284 a(n) = Sum_{i=1..n} (i-1)*T(i)^2, where T(i) = A000073(i) is the i-th tribonacci number.

Table of values

n a(n)
1 0
2 1
3 3
4 15
5 79
6 324
7 1338
8 5370
9 20858
10 79907
11 301917
12 1127753
13 4175945
14 15347222
15 56045572
16 203563012
17 735880196
18 2649245173
19 9502874215
20 33976624115
21 121128306995
22 430701953720
23 1527852568478
24 5408197139806
25 19106052817630
26 67376379676855
27 237205619596129
28 833831061604429
29 2926954896983117

List of values

[0, 1, 3, 15, 79, 324, 1338, 5370, 20858, 79907, 301917, 1127753, 4175945, 15347222, 56045572, 203563012, 735880196, 2649245173, 9502874215, 33976624115, 121128306995, 430701953720, 1527852568478, 5408197139806, 19106052817630, 67376379676855, 237205619596129, 833831061604429, 2926954896983117]

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

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