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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.

A284250 Number of subsets of [n] whose sum is a triangular number.

Table of values

n a(n)
0 1
1 2
2 3
3 5
4 7
5 11
6 18
7 29
8 49
9 85
10 151
11 271
12 493
13 904
14 1674
15 3118
16 5835
17 10966
18 20698
19 39187
20 74413
21 141684
22 270386
23 517110
24 990889
25 1902108
26 3657241
27 7042490
28 13580079
29 26220417
30 50687371
31 98095126
32 190042856
33 368539253
34 715349145
35 1389731960
36 2702098563

List of values

[1, 2, 3, 5, 7, 11, 18, 29, 49, 85, 151, 271, 493, 904, 1674, 3118, 5835, 10966, 20698, 39187, 74413, 141684, 270386, 517110, 990889, 1902108, 3657241, 7042490, 13580079, 26220417, 50687371, 98095126, 190042856, 368539253, 715349145, 1389731960, 2702098563]

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

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