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A185334 as a simple table

na(n)
01
10
20
31
42
56
623
7112
8801
97840
1097723
111436873
1223791155
13432878091
148544173926
15181519645163
164127569521160

[1,0,0,1,2,6,23,112,801,7840,97723,1436873,
 23791155,432878091,8544173926,181519645163,
 4127569521160]