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A304068 as a simple table

na(n)
10
20
31
44
514
645
7140
8424
91269
103760
1111080
1232517
1395190
14278154
15811887
162367973
176903453
1820120905
1958639016
20170894228
21498084608
221451899005
234232957241
2412343454790
2536001675800
26105028397290
27306472665459
28894497511566

[0,0,1,4,14,45,140,424,1269,3760,11080,32517,
 95190,278154,811887,2367973,6903453,20120905,
 58639016,170894228,498084608,1451899005,
 4232957241,12343454790,36001675800,105028397290,
 306472665459,894497511566]