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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.

A049818 a(n) = Sum_{k=1..n, m=1..n} T(m,k), array T as in A049816.

Table of values

n a(n)
1 0
2 0
3 1
4 2
5 6
6 8
7 15
8 22
9 30
10 38
11 55
12 64
13 84
14 102
15 119
16 138
17 168
18 192
19 229
20 254
21 284
22 318
23 369
24 400
25 444
26 492
27 541
28 586
29 654
30 696
31 767
32 826
33 890
34 962
35 1029
36 1086
37 1174
38 1256
39 1341
40 1412
41 1518
42 1590
43 1703
44 1792
45 1880
46 1986
47 2117

List of values

[0, 0, 1, 2, 6, 8, 15, 22, 30, 38, 55, 64, 84, 102, 119, 138, 168, 192, 229, 254, 284, 318, 369, 400, 444, 492, 541, 586, 654, 696, 767, 826, 890, 962, 1029, 1086, 1174, 1256, 1341, 1412, 1518, 1590, 1703, 1792, 1880, 1986, 2117]

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

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