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A056932 as a simple table

n a(n)
0 1
1 20
2 168
3 887
4 3490
5 11196
6 30900
7 75966
8 170379
9 354640
10 693836
11 1288365
12 2287844
13 3908776
14 6456600
15 10352796
16 16167765
17 24660252
18 36824128
19 53943395
20 77656326
21 110029700
22 153644140
23 211691610
24 288086175
25 387589176
26 515950020
27 680063833
28 888147272

[1,20,168,887,3490,11196,30900,75966,170379,
 354640,693836,1288365,2287844,3908776,6456600,
 10352796,16167765,24660252,36824128,53943395,
 77656326,110029700,153644140,211691610,288086175,
 387589176,515950020,680063833,888147272]

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Last modified February 16 21:59 EST 2019. Contains 320200 sequences. (Running on oeis4.)