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A006924 as a simple table

na(n)
00
10
20
31
42
55
620
7101
8743
97350
1091763
111344782
1222160335
13401278984
147885687604
15166870266608
163781101495300

[0,0,0,1,2,5,20,101,743,7350,91763,1344782,
 22160335,401278984,7885687604,166870266608,
 3781101495300]