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A187756 as a simple table

n a(n)
0 0
1 1
2 20
3 105
4 336
5 825
6 1716
7 3185
8 5440
9 8721
10 13300
11 19481
12 27600
13 38025
14 51156
15 67425
16 87296
17 111265
18 139860
19 173641
20 213200
21 259161
22 312180
23 372945
24 442176
25 520625
26 609076
27 708345
28 819280
29 942761
30 1079700
31 1231041
32 1397760
33 1580865
34 1781396
35 2000425

[0,1,20,105,336,825,1716,3185,5440,8721,13300,
 19481,27600,38025,51156,67425,87296,111265,139860,
 173641,213200,259161,312180,372945,442176,520625,
 609076,708345,819280,942761,1079700,1231041,
 1397760,1580865,1781396,2000425]

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Last modified April 9 10:52 EDT 2020. Contains 333348 sequences. (Running on oeis4.)