login

A033438 as a simple table

na(n)
00
10
21
33
46
510
615
720
826
933
1041
1150
1260
1370
1481
1593
16106
17120
18135
19150
20166
21183
22201
23220
24240
25260
26281
27303
28326
29350
30375
31400
32426
33453
34481
35510
36540
37570
38601
39633
40666
41700
42735
43770
44806
45843
46881

[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]