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A055551 as a simple table

na(n)
10
20
31
412
536
6114
7375
81071
92939
107706
1120417
1253332
13139597
14364217
15957111
162526795
176725234
1818069359
1948961462

[0,0,1,12,36,114,375,1071,2939,7706,20417,53332,
 139597,364217,957111,2526795,6725234,18069359,
 48961462]