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A006936 as a simple table

na(n)
00
11
20
32
412
574
6538
74682
847280
9545832
107087186
11102247562
121622632020
1328091567594
14526858343698
1510641342970366
16230283190930560
175315654681981354
18130370767028589528
193385534663256845322

[0,1,0,2,12,74,538,4682,47280,545832,7087186,
 102247562,1622632020,28091567594,526858343698,
 10641342970366,230283190930560,5315654681981354,
 130370767028589528,3385534663256845322]