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A374720 as a simple table

na(n)
10
21
30
44
531
670
73183
839814
9261736
103371352
115739969
12293929700
134459515314
147926716167
15101442372383
161872646502198
1724092766475124
1849919329395336
1975900705950969503
20882317013876917212
2132018280652900418322
22883821770134261220212

[0,1,0,4,31,70,3183,39814,261736,3371352,5739969,
 293929700,4459515314,7926716167,101442372383,
 1872646502198,24092766475124,49919329395336,
 75900705950969503,882317013876917212,
 32018280652900418322,883821770134261220212]