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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.

A253476 Indices of centered triangular numbers (A005448) which are also centered heptagonal numbers (A069099).

Table of values

n a(n)
1 1
2 15
3 70
4 1596
5 7645
6 175491
7 840826
8 19302360
9 92483161
10 2123084055
11 10172306830
12 233519943636
13 1118861268085
14 25685070715851
15 123064567182466
16 2825124258799920
17 13535983528803121
18 310737983397275295
19 1488835123601160790
20 34178353049441482476

List of values

[1, 15, 70, 1596, 7645, 175491, 840826, 19302360, 92483161, 2123084055, 10172306830, 233519943636, 1118861268085, 25685070715851, 123064567182466, 2825124258799920, 13535983528803121, 310737983397275295, 1488835123601160790, 34178353049441482476]

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

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