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A253145 as a simple table

n a(n)
0 0
1 3
2 6
3 10
4 15
5 21
6 28
7 36
8 45
9 55
10 66
11 78
12 91
13 105
14 120
15 136
16 153
17 171
18 190
19 210
20 231
21 253
22 276
23 300
24 325
25 351
26 378
27 406
28 435
29 465
30 496
31 528
32 561
33 595
34 630
35 666
36 703
37 741
38 780
39 820
40 861
41 903
42 946
43 990
44 1035
45 1081
46 1128
47 1176
48 1225
49 1275

[0,3,6,10,15,21,28,36,45,55,66,78,91,105,120,136,
 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]

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Last modified May 2 09:54 EDT 2024. Contains 372191 sequences. (Running on oeis4.)