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.

A281253 Alternately concatenate the decimal digits from front to back 1...n such that n is always to the right.

Table of values

n a(n)
1 1
2 12
3 213
4 3124
5 42135
6 531246
7 6421357
8 75312468
9 864213579
10 97531246810
11 1086421357911
12 119753124681012
13 12108642135791113
14 1311975312468101214
15 141210864213579111315
16 15131197531246810121416
17 1614121086421357911131517

List of values

[1, 12, 213, 3124, 42135, 531246, 6421357, 75312468, 864213579, 97531246810, 1086421357911, 119753124681012, 12108642135791113, 1311975312468101214, 141210864213579111315, 15131197531246810121416, 1614121086421357911131517]

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

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