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A105339 as a simple table

n a(n)
0 0
1 1
2 3
3 6
4 10
5 15
6 21
7 28
8 36
9 45
10 55
11 66
12 78
13 91
14 105
15 120
16 136
17 153
18 171
19 190
20 210
21 231
22 253
23 276
24 300
25 325
26 351
27 378
28 406
29 435
30 465
31 496
32 528
33 561
34 595
35 630
36 666
37 703
38 741
39 780
40 820
41 861
42 903
43 946
44 990
45 11
46 57
47 104
48 152
49 201
50 251
51 302
52 354
53 407
54 461
55 516
56 572
57 629

[0,1,3,6,10,15,21,28,36,45,55,66,78,91,105,120,
 136,153,171,190,210,231,253,276,300,325,351,378,
 406,435,465,496,528,561,595,630,666,703,741,780,
 820,861,903,946,990,11,57,104,152,201,251,302,354,
 407,461,516,572,629]

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Last modified January 19 20:41 EST 2020. Contains 331066 sequences. (Running on oeis4.)