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A121050 as a simple table

na(n)
10
20
30
40
50
61
75
818
962
10226
11892
123835
1317910
1490401
15490421
162844970
1717570207
18115078228
19796630963
205811215750
2144551231383
22358087648032
233010990488143
2426433752431402
25241852566790848
262302304545944415
2722768248457537798
28233580248716343376

[0,0,0,0,0,1,5,18,62,226,892,3835,17910,90401,
 490421,2844970,17570207,115078228,796630963,
 5811215750,44551231383,358087648032,3010990488143,
 26433752431402,241852566790848,2302304545944415,
 22768248457537798,233580248716343376]