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A241784 as a simple table

na(n)
11
21
32
46
513
644
7144
8577
92457
1012499
1172394
12508942
134408389
1449858593
15769196039
1616729819397

[1,1,2,6,13,44,144,577,2457,12499,72394,508942,
 4408389,49858593,769196039,16729819397]