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A035884 as a simple table

na(n)
01
10
2512
30
444032
50
61549824
70
830349312
9524288
10391784960
1126738688
123702064128
13508035072
1427315850752
155588385792
16164415418368
1742844291072
18834237682176
19253170810880
203662806408192
211226904698880
2214215186707968
235082890895360
2449621579941888

[1,0,512,0,44032,0,1549824,0,30349312,524288,
 391784960,26738688,3702064128,508035072,
 27315850752,5588385792,164415418368,42844291072,
 834237682176,253170810880,3662806408192,
 1226904698880,14215186707968,5082890895360,
 49621579941888]