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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.

A053678 Let Oc(n) = A005900(n) = n-th octahedral number. Consider all integer triples (i,j,k), j >= k > 0, with Oc(i) = Oc(j)+Oc(k), ordered by increasing i; sequence gives k values.

Table of values

n a(n)
1 5
2 17
3 191
4 1412
5 2143
6 8393
7 5346
8 32475
9 99234
10 158712
11 393981
12 401023
13 514617
14 921485
15 577350
16 910495
17 1430793
18 3236406
19 462236
20 4122855

List of values

[5, 17, 191, 1412, 2143, 8393, 5346, 32475, 99234, 158712, 393981, 401023, 514617, 921485, 577350, 910495, 1430793, 3236406, 462236, 4122855]

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

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