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A112410 as a simple table

na(n)
10
20
30
41
55
617
756
8182
9573
101792
115533
1216977
1351652
14156291
15470069
161407264
174193977
1812451760
1936838994
20108656009
21319583578
22937634011
232744720126
248018165821
2523379886511
2668056985580
27197800670948
28574068309840
291663907364480
304816910618093
3113929036720057

[0,0,0,1,5,17,56,182,573,1792,5533,16977,51652,
 156291,470069,1407264,4193977,12451760,36838994,
 108656009,319583578,937634011,2744720126,
 8018165821,23379886511,68056985580,197800670948,
 574068309840,1663907364480,4816910618093,
 13929036720057]