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A181770 as a simple table

na(n)
01
11
22
36
419
574
6353
72080
816023
9159526
102093244
1136265070
12836395102
1325794670618

[1,1,2,6,19,74,353,2080,16023,159526,2093244,
 36265070,836395102,25794670618]