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.

A281784 Number of permutations of size n avoiding the three vincular patterns 2-41-3, 3-14-2 and 3-41-2.

Table of values

n a(n)
1 1
2 2
3 6
4 21
5 82
6 346
7 1547
8 7236
9 35090
10 175268
11 897273
12 4690392
13 24961300
14 134917123
15 739213795
16 4099067786
17 22973964976
18 129998127216
19 741951610676
20 4267733183951
21 24722711348105
22 144147076572858
23 845460619537567
24 4986014094568416
25 29553202933497989
26 175988793822561947
27 1052569034807964425
28 6320797287983675428
29 38100643422386086309
30 230476496238489596293
31 1398812189780917895946
32 8516159717810715750712
33 51999675864641162206960
34 318388601290603235387353
35 1954555567303560704554767
36 12028490623505389875097231
37 74197729371621673254309374
38 458706129189543207063584184
39 2841808950641424998337843123

List of values

[1, 2, 6, 21, 82, 346, 1547, 7236, 35090, 175268, 897273, 4690392, 24961300, 134917123, 739213795, 4099067786, 22973964976, 129998127216, 741951610676, 4267733183951, 24722711348105, 144147076572858, 845460619537567, 4986014094568416, 29553202933497989, 175988793822561947, 1052569034807964425, 6320797287983675428, 38100643422386086309, 230476496238489596293, 1398812189780917895946, 8516159717810715750712, 51999675864641162206960, 318388601290603235387353, 1954555567303560704554767, 12028490623505389875097231, 74197729371621673254309374, 458706129189543207063584184, 2841808950641424998337843123]

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

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