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A006923 as a simple table

na(n)
00
10
21
31
43
513
663
7399
83268
933496
10412943
115883727
1294159721
131661723296
1431954666517
15663988090257
1614814445040728

[0,0,1,1,3,13,63,399,3268,33496,412943,5883727,
 94159721,1661723296,31954666517,663988090257,
 14814445040728]