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A001803 as a simple table

na(n)
01
13
215
335
4315
5693
63003
76435
8109395
9230945
10969969
112028117
1216900975
1335102025
14145422675
15300540195
169917826435
1720419054425
1883945001525
19172308161025
201412926920405
212893136075115
2211835556670925

[1,3,15,35,315,693,3003,6435,109395,230945,969969,
 2028117,16900975,35102025,145422675,300540195,
 9917826435,20419054425,83945001525,172308161025,
 1412926920405,2893136075115,11835556670925]