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A000217 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 1035
46 1081
47 1128
48 1176
49 1225
50 1275
51 1326
52 1378
53 1431

[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,
 820,861,903,946,990,1035,1081,1128,1176,1225,1275,
 1326,1378,1431]

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Last modified February 25 20:39 EST 2018. Contains 299656 sequences. (Running on oeis4.)