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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.

A249906 a(n) is the index of the first occurrence of n in A249905, or -1 if n does not occur.

Table of values

n	a(n)
1	1
2	0
3	-1
4	3
5	2
6	5
7	9
8	13
9	89
10	485
11	4891

List of values

[1, 0, -1, 3, 2, 5, 9, 13, 89, 485, 4891]

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

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