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A030180 as a simple table

n a(n)
0 0
1 0
2 3
3 52
4 390
5 1860
6 6665
7 19608
8 49932
9 113880
10 238095
11 463980
12 853138
13 1494012
14 2509845
15 4068080
16 6391320
17 9769968
18 14576667
19 21282660
20 30476190
21 42883060
22 59389473
23 81067272
24 109201700
25 145321800
26 191233575
27 249056028
28 321260202
29 410711340
30 520714285

[0,0,3,52,390,1860,6665,19608,49932,113880,238095,
 463980,853138,1494012,2509845,4068080,6391320,
 9769968,14576667,21282660,30476190,42883060,
 59389473,81067272,109201700,145321800,191233575,
 249056028,321260202,410711340,520714285]

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Last modified January 17 09:50 EST 2020. Contains 330949 sequences. (Running on oeis4.)