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A322859 as a simple table

na(n)
01
11
22
34
414
552
6256
71396
89064
962420
10500000
114250180
1240738880
13410140060
144572668112
1553214384548
16676739353112

[1,1,2,4,14,52,256,1396,9064,62420,500000,4250180,
 40738880,410140060,4572668112,53214384548,
 676739353112]