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A071817 as a simple table

n a(n)
1 1
2 3
3 6
4 10
5 15
6 21
7 28
8 36
9 45
10 54
11 61
12 66
13 69
14 70
15 69
16 66
17 61
18 54
19 45
20 36
21 28
22 21
23 15
24 10
25 6
26 3
27 1

[1,3,6,10,15,21,28,36,45,54,61,66,69,70,69,66,61,
 54,45,36,28,21,15,10,6,3,1]

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Last modified March 22 10:07 EDT 2019. Contains 321421 sequences. (Running on oeis4.)