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A363200 as a simple table

na(n)
11
21
32
45
515
655
7248
81256
96844
1038930
11226961
121345641
138072770
1448882245
15298237393

[1,1,2,5,15,55,248,1256,6844,38930,226961,1345641,
 8072770,48882245,298237393]