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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.

A326114 Number of subsets of {2..n} containing no product of two or more (not necessarily distinct) elements.

Table of values

n a(n)
0 1
1 1
2 2
3 4
4 6
5 12
6 22
7 44
8 76
9 116
10 222
11 444
12 788
13 1576
14 3068
15 5740
16 8556
17 17112
18 31752
19 63504
20 116176
21 221104
22 438472
23 876944
24 1569424
25 2447664
26 4869576
27 9070920
28 17022360
29 34044720
30 61923312
31 123846624
32 234698720
33 462007072
34 922838192
35 1734564112
36 2591355792
37 5182711584

List of values

[1, 1, 2, 4, 6, 12, 22, 44, 76, 116, 222, 444, 788, 1576, 3068, 5740, 8556, 17112, 31752, 63504, 116176, 221104, 438472, 876944, 1569424, 2447664, 4869576, 9070920, 17022360, 34044720, 61923312, 123846624, 234698720, 462007072, 922838192, 1734564112, 2591355792, 5182711584]

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

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