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A180392 as a simple table

na(n)
10
20
31
412
566
6248
7739
81880
94260
108832
1117061
1231108
1354054
1490168
15145223
16226864

[0,0,1,12,66,248,739,1880,4260,8832,17061,31108,
 54054,90168,145223,226864]