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.

A116485 Number of permutations in S_n that avoid the pattern 12453 (or equivalently, 31245).

Table of values

n a(n)
0 1
1 1
2 2
3 6
4 24
5 119
6 694
7 4581
8 33286
9 260927
10 2174398
11 19053058
12 174094868
13 1648198050
14 16085475576
15 161174636600
16 1652590573612
17 17292601075489
18 184246699159418
19 1995064785620557
20 21919480341617102
21 244015986016996763
22 2749174129340156922
23 31313478171012371344

List of values

[1, 1, 2, 6, 24, 119, 694, 4581, 33286, 260927, 2174398, 19053058, 174094868, 1648198050, 16085475576, 161174636600, 1652590573612, 17292601075489, 184246699159418, 1995064785620557, 21919480341617102, 244015986016996763, 2749174129340156922, 31313478171012371344]

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

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