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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.

A367396 Number of subsets of {1..n} whose cardinality is the sum of two distinct elements.

Table of values

n a(n)
0 0
1 0
2 0
3 1
4 3
5 7
6 17
7 40
8 90
9 199
10 435
11 939
12 2007
13 4258
14 8976
15 18817
16 39263
17 81595
18 168969
19 348820
20 718134
21 1474863
22 3022407
23 6181687
24 12621135
25 25727686
26 52369508
27 106460521
28 216162987
29 438431215
30 888359841
31 1798371648
32 3637518354
33 7351824439
34 14848255803

List of values

[0, 0, 0, 1, 3, 7, 17, 40, 90, 199, 435, 939, 2007, 4258, 8976, 18817, 39263, 81595, 168969, 348820, 718134, 1474863, 3022407, 6181687, 12621135, 25727686, 52369508, 106460521, 216162987, 438431215, 888359841, 1798371648, 3637518354, 7351824439, 14848255803]

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

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