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A371350 as a simple table

na(n)
10
20
30
41
53
616
778
8397
92037
1010820
1158349
12320824
131790189
1410125858
1557938771
16334941363
171953830203
1811489589280
1968053757016
20405714603234
212433001205088
2214668531344984
2388869454457853
24540834122500464

[0,0,0,1,3,16,78,397,2037,10820,58349,320824,
 1790189,10125858,57938771,334941363,1953830203,
 11489589280,68053757016,405714603234,
 2433001205088,14668531344984,88869454457853,
 540834122500464]