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A059270 as a simple table

n a(n)
0 0
1 3
2 15
3 42
4 90
5 165
6 273
7 420
8 612
9 855
10 1155
11 1518
12 1950
13 2457
14 3045
15 3720
16 4488
17 5355
18 6327
19 7410
20 8610
21 9933
22 11385
23 12972
24 14700
25 16575
26 18603
27 20790
28 23142
29 25665
30 28365
31 31248
32 34320
33 37587
34 41055
35 44730
36 48618
37 52725
38 57057
39 61620

[0,3,15,42,90,165,273,420,612,855,1155,1518,1950,
 2457,3045,3720,4488,5355,6327,7410,8610,9933,
 11385,12972,14700,16575,18603,20790,23142,25665,
 28365,31248,34320,37587,41055,44730,48618,52725,
 57057,61620]

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Last modified February 27 15:49 EST 2020. Contains 332307 sequences. (Running on oeis4.)