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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.

A260861 Base-11 representation of a(n) is the concatenation of the base-11 representations of 1, 2, ..., n, n-1, ..., 1.

Table of values

n a(n)
0 0
1 1
2 144
3 17689
4 2143296
5 259371025
6 31384248336
7 3797497946089
8 459497294348544
9 55599173087763361
10 6727499948806851600
11 8954302429379707945271
12 131099941868210323821706774
13 1919434248892467772593071038679
14 28102436838034620750856132266604106

List of values

[0, 1, 144, 17689, 2143296, 259371025, 31384248336, 3797497946089, 459497294348544, 55599173087763361, 6727499948806851600, 8954302429379707945271, 131099941868210323821706774, 1919434248892467772593071038679, 28102436838034620750856132266604106]

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

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