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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.

A320854 Number of 8-element subsets of [n] whose sum is a triangular number.

Table of values

n a(n)
8 1
9 1
10 5
11 17
12 48
13 122
14 276
15 573
16 1112
17 2042
18 3578
19 6024
20 9803
21 15476
22 23793
23 35728
24 52522
25 75761
26 107416
27 149923
28 206288
29 280145
30 375868
31 498713
32 654914
33 851807
34 1098032
35 1403673
36 1780402
37 2241738
38 2803237
39 3482687
40 4300406
41 5279489
42 6446078
43 7829696
44 9463558

List of values

[1, 1, 5, 17, 48, 122, 276, 573, 1112, 2042, 3578, 6024, 9803, 15476, 23793, 35728, 52522, 75761, 107416, 149923, 206288, 280145, 375868, 498713, 654914, 851807, 1098032, 1403673, 1780402, 2241738, 2803237, 3482687, 4300406, 5279489, 6446078, 7829696, 9463558]

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

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