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A087539 as a simple table

n a(n)
1 0
2 0
3 1
4 2
5 3
6 5
7 7
8 10
9 12
10 15
11 18
12 22
13 26
14 30
15 35
16 40
17 46
18 51
19 57
20 63
21 70
22 77
23 84
24 92
25 100
26 109
27 117
28 126
29 135
30 145
31 155
32 165
33 176
34 187
35 199
36 210
37 222
38 234
39 247
40 260
41 273
42 287
43 301
44 316
45 330
46 345
47 360
48 376
49 392
50 408
51 425
52 442
53 460
54 477
55 495
56 513

[0,0,1,2,3,5,7,10,12,15,18,22,26,30,35,40,46,51,
 57,63,70,77,84,92,100,109,117,126,135,145,155,165,
 176,187,199,210,222,234,247,260,273,287,301,316,
 330,345,360,376,392,408,425,442,460,477,495,513]

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Last modified June 10 07:17 EDT 2024. Contains 373253 sequences. (Running on oeis4.)