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A025715 as a simple table

n a(n)
0 1
1 3
2 6
3 10
4 15
5 21
6 28
7 36
8 45
9 56
10 68
11 81
12 95
13 110
14 126
15 143
16 161
17 180
18 201
19 223
20 246
21 270
22 295
23 321
24 348
25 376
26 405
27 436
28 468
29 501
30 535
31 570
32 606
33 643
34 681
35 720
36 761
37 803
38 846
39 890
40 935
41 981
42 1028
43 1076
44 1125
45 1176
46 1228
47 1281
48 1335
49 1390
50 1446
51 1503
52 1561
53 1621

[1,3,6,10,15,21,28,36,45,56,68,81,95,110,126,143,
 161,180,201,223,246,270,295,321,348,376,405,436,
 468,501,535,570,606,643,681,720,761,803,846,890,
 935,981,1028,1076,1125,1176,1228,1281,1335,1390,
 1446,1503,1561,1621]

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Last modified April 23 22:36 EDT 2024. Contains 371917 sequences. (Running on oeis4.)