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.

A253457 Indices of centered hexagonal numbers (A003215) which are also centered heptagonal numbers (A069099).

Table of values

n a(n)
1 1
2 14
3 351
4 9100
5 236237
6 6133050
7 159223051
8 4133666264
9 107316099801
10 2786084928550
11 72330892042487
12 1877817108176100
13 48750913920536101
14 1265645944825762514
15 32858043651549289251
16 853043488995455758000
17 22146272670230300418737
18 574950045936992355129150

List of values

[1, 14, 351, 9100, 236237, 6133050, 159223051, 4133666264, 107316099801, 2786084928550, 72330892042487, 1877817108176100, 48750913920536101, 1265645944825762514, 32858043651549289251, 853043488995455758000, 22146272670230300418737, 574950045936992355129150]

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

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