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.

A272617 Concatenation of the numbers from n down to 1 with numbers from 1 to n.

Table of values

n a(n)
1 11
2 2112
3 321123
4 43211234
5 5432112345
6 654321123456
7 76543211234567
8 8765432112345678
9 987654321123456789
10 1098765432112345678910
11 11109876543211234567891011
12 121110987654321123456789101112
13 1312111098765432112345678910111213
14 14131211109876543211234567891011121314

List of values

[11, 2112, 321123, 43211234, 5432112345, 654321123456, 76543211234567, 8765432112345678, 987654321123456789, 1098765432112345678910, 11109876543211234567891011, 121110987654321123456789101112, 1312111098765432112345678910111213, 14131211109876543211234567891011121314]

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

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