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A033438 as a simple table

n a(n)
0 0
1 0
2 1
3 3
4 6
5 10
6 15
7 20
8 26
9 33
10 41
11 50
12 60
13 70
14 81
15 93
16 106
17 120
18 135
19 150
20 166
21 183
22 201
23 220
24 240
25 260
26 281
27 303
28 326
29 350
30 375
31 400
32 426
33 453
34 481
35 510
36 540
37 570
38 601
39 633
40 666
41 700
42 735
43 770
44 806
45 843
46 881

[0,0,1,3,6,10,15,20,26,33,41,50,60,70,81,93,106,
 120,135,150,166,183,201,220,240,260,281,303,326,
 350,375,400,426,453,481,510,540,570,601,633,666,
 700,735,770,806,843,881]

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Last modified March 28 12:26 EDT 2024. Contains 371254 sequences. (Running on oeis4.)