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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.

A337285 a(n) = Sum_{i=1..n} (i-1)^2*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 5
4 41
5 297
6 1522
7 7606
8 35830
9 159734
10 691175
11 2911275
12 11995471
13 48573775
14 193800376
15 763577276
16 2976338876
17 11493413820
18 44020618429
19 167385941185
20 632387189285
21 2375420846885
22 8876467428110
23 33013780952786
24 122261706093330
25 451010242361106
26 1657768413841731
27 6073328651742855

List of values

[0, 1, 5, 41, 297, 1522, 7606, 35830, 159734, 691175, 2911275, 11995471, 48573775, 193800376, 763577276, 2976338876, 11493413820, 44020618429, 167385941185, 632387189285, 2375420846885, 8876467428110, 33013780952786, 122261706093330, 451010242361106, 1657768413841731, 6073328651742855]

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

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