cp's OEIS Frontend

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.

A254284 Indices of centered triangular numbers (A005448) which are also hexagonal numbers (A000384).

Table of values

n a(n)
1 1
2 36
3 133
4 6888
5 25705
6 1336140
7 4986541
8 259204176
9 967363153
10 50284273908
11 187663465045
12 9754889933880
13 36405744855481
14 1892398362898716
15 7062526838498173
16 367115527512416928
17 1370093800923789985
18 71218519939045985220
19 265791134852376758821

List of values

[1, 36, 133, 6888, 25705, 1336140, 4986541, 259204176, 967363153, 50284273908, 187663465045, 9754889933880, 36405744855481, 1892398362898716, 7062526838498173, 367115527512416928, 1370093800923789985, 71218519939045985220, 265791134852376758821]

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

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