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A336678 as a simple table

na(n)
01
11
22
33
46
510
620
735
870
9126
10252
11461
12922
131702
143404
156315
1612630
1723494
1846988
1987533
20175066
21326382
22652764
231217483
242434966
254542526
269085052
2716950573
2833901146
2963255670
30126511340
31236063915
32472127830
33880983606
341761967212
353287837741

[1,1,2,3,6,10,20,35,70,126,252,461,922,1702,3404,
 6315,12630,23494,46988,87533,175066,326382,652764,
 1217483,2434966,4542526,9085052,16950573,33901146,
 63255670,126511340,236063915,472127830,880983606,
 1761967212,3287837741]