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.

A253880 Triangular numbers (A000217) that are also centered heptagonal numbers (A069099).

Table of values

n a(n)
1 1
2 253
3 64261
4 16322041
5 4145734153
6 1053000152821
7 267457893082381
8 67933251842771953
9 17254778510170993681
10 4382645808331589623021
11 1113174780537713593253653
12 282742011610770921096804841
13 71815357774355276244995175961
14 18240818132674629395307677889253

List of values

[1, 253, 64261, 16322041, 4145734153, 1053000152821, 267457893082381, 67933251842771953, 17254778510170993681, 4382645808331589623021, 1113174780537713593253653, 282742011610770921096804841, 71815357774355276244995175961, 18240818132674629395307677889253]

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

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