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.

A260865 Base-15 representation of a(n) is the concatenation of the base-15 representations of 1, 2, ..., n, n-1, ..., 1.

Table of values

n a(n)
0 0
1 1
2 256
3 58081
4 13075456
5 2942086081
6 661970995456
7 148943498386081
8 33512287502995456
9 7540264693665886081
10 1696559556157202995456
11 381725900136606353386081
12 85888327530754964702995456
13 19324873694420145086040886081

List of values

[0, 1, 256, 58081, 13075456, 2942086081, 661970995456, 148943498386081, 33512287502995456, 7540264693665886081, 1696559556157202995456, 381725900136606353386081, 85888327530754964702995456, 19324873694420145086040886081]

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

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