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A004529 as a simple table

na(n)
01
11
21
31
42
56
618
754
8216
91080
105400
1127000
12162000
131134000
147938000
1555566000
16444528000
174000752000
1836006768000
19324060912000
203240609120000
2135646700320000
22392113703520000
234313250738720000

[1,1,1,1,2,6,18,54,216,1080,5400,27000,162000,
 1134000,7938000,55566000,444528000,4000752000,
 36006768000,324060912000,3240609120000,
 35646700320000,392113703520000,4313250738720000]