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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.

A320856 Number of 10-element subsets of [n] whose sum is a triangular number.

Table of values

n a(n)
10 1
11 1
12 6
13 24
14 81
15 238
16 617
17 1456
18 3192
19 6568
20 12821
21 23921
22 42902
23 74326
24 124878
25 204143
26 325604
27 507933
28 776532
29 1165523
30 1720164
31 2499704
32 3580966
33 5062537
34 7069701
35 9760408
36 13332198
37 18030171
38 24156438
39 32081010
40 42254089
41 55220424
42 71635678
43 92284742

List of values

[1, 1, 6, 24, 81, 238, 617, 1456, 3192, 6568, 12821, 23921, 42902, 74326, 124878, 204143, 325604, 507933, 776532, 1165523, 1720164, 2499704, 3580966, 5062537, 7069701, 9760408, 13332198, 18030171, 24156438, 32081010, 42254089, 55220424, 71635678, 92284742]

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

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