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A238921 as a simple table

n a(n)
0 0
1 0
2 0
3 0
4 0
5 0
6 0
7 0
8 0
9 0
10 0
11 2620
12 18228
13 91600
14 400300
15 1604246
16 6098862
17 22340672
18 79928946
19 281441131
20 981869555
21 3421660163
22 11978105085
23 42029994744
24 147596654412
25 518045934492
26 1815662189788
27 6350004678048
28 22151452791824
29 77058178272192

[0,0,0,0,0,0,0,0,0,0,0,2620,18228,91600,400300,
 1604246,6098862,22340672,79928946,281441131,
 981869555,3421660163,11978105085,42029994744,
 147596654412,518045934492,1815662189788,
 6350004678048,22151452791824,77058178272192]

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Last modified January 25 18:32 EST 2022. Contains 350572 sequences. (Running on oeis4.)