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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.

A240739 Number of compositions of n having exactly four fixed points.

Table of values

n a(n)
10 1
11 1
12 3
13 7
14 16
15 30
16 70
17 144
18 299
19 615
20 1261
21 2584
22 5238
23 10624
24 21482
25 43350
26 87331
27 175703
28 353074
29 708963
30 1422445
31 2852299
32 5716668
33 11453033
34 22938117
35 45928418
36 91941762
37 184021452
38 368267172
39 736898601
40 1474388631
41 2949737232
42 5901032198
43 11804591355

List of values

[1, 1, 3, 7, 16, 30, 70, 144, 299, 615, 1261, 2584, 5238, 10624, 21482, 43350, 87331, 175703, 353074, 708963, 1422445, 2852299, 5716668, 11453033, 22938117, 45928418, 91941762, 184021452, 368267172, 736898601, 1474388631, 2949737232, 5901032198, 11804591355]

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

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