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A228673 as a simple table

n a(n)
6 1
7 0
8 0
9 0
10 0
11 0
12 923
13 3430
14 6004
15 10008
16 16014
17 24750
18 17153135
19 139520497
20 747544744
21 2907714483
22 9788905840
23 30236892651
24 2389382438831
25 33146052783575
26 291048293120402
27 2033077226586965
28 11881137473504364
29 61473838487159979
30 1656802388288612691

[1,0,0,0,0,0,923,3430,6004,10008,16014,24750,
 17153135,139520497,747544744,2907714483,
 9788905840,30236892651,2389382438831,
 33146052783575,291048293120402,2033077226586965,
 11881137473504364,61473838487159979,
 1656802388288612691]

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Last modified September 21 01:46 EDT 2021. Contains 347596 sequences. (Running on oeis4.)