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A001840 as a simple table

n a(n)
0 0
1 1
2 2
3 3
4 5
5 7
6 9
7 12
8 15
9 18
10 22
11 26
12 30
13 35
14 40
15 45
16 51
17 57
18 63
19 70
20 77
21 84
22 92
23 100
24 108
25 117
26 126
27 135
28 145
29 155
30 165
31 176
32 187
33 198
34 210
35 222
36 234
37 247
38 260
39 273
40 287
41 301
42 315
43 330
44 345
45 360
46 376
47 392
48 408
49 425
50 442
51 459
52 477
53 495
54 513
55 532
56 551
57 570
58 590

[0,1,2,3,5,7,9,12,15,18,22,26,30,35,40,45,51,57,
 63,70,77,84,92,100,108,117,126,135,145,155,165,
 176,187,198,210,222,234,247,260,273,287,301,315,
 330,345,360,376,392,408,425,442,459,477,495,513,
 532,551,570,590]

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Last modified March 4 19:58 EST 2021. Contains 341797 sequences. (Running on oeis4.)