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A264816 as a simple table

na(n)
11
21
34
414
547
6201
71331
811644
9101575
101079100
1111958564
12169047968
132375578880
1439413148160
15962468127744
1618758145972224

[1,1,4,14,47,201,1331,11644,101575,1079100,
 11958564,169047968,2375578880,39413148160,
 962468127744,18758145972224]