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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.

A224814 Number of subsets of {1,2,...,n-9} without differences equal to 3, 6 or 9.

Table of values

n a(n)
0 1
1 1
2 1
3 1
4 1
5 1
6 1
7 1
8 1
9 1
10 2
11 4
12 8
13 12
14 18
15 27
16 36
17 48
18 64
19 80
20 100
21 125
22 175
23 245
24 343
25 490
26 700
27 1000
28 1400
29 1960
30 2744
31 3724
32 5054
33 6859
34 9386
35 12844
36 17576
37 24336
38 33696
39 46656
40 64800
41 90000
42 125000
43 172500
44 238050
45 328509
46 452295
47 622725
48 857375
49 1182275
50 1630295
51 2248091
52 3106141
53 4291691
54 5929741
55 8190250
56 11312500
57 15625000
58 21562500

List of values

[1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 4, 8, 12, 18, 27, 36, 48, 64, 80, 100, 125, 175, 245, 343, 490, 700, 1000, 1400, 1960, 2744, 3724, 5054, 6859, 9386, 12844, 17576, 24336, 33696, 46656, 64800, 90000, 125000, 172500, 238050, 328509, 452295, 622725, 857375, 1182275, 1630295, 2248091, 3106141, 4291691, 5929741, 8190250, 11312500, 15625000, 21562500]