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A273873 as a simple table

na(n)
11
21
32
43
56
612
728
865
9166
10412
111076
122806
137524
1420020
1554744
16148417
17410078
181126732
193144500
208728570
2124555900
2268713420
23194469616
24548088278
251559301428
264418131108
2712628267512
2835957541462
29103150588492
30294924202032
31848878072440
322435729999665

[1,1,2,3,6,12,28,65,166,412,1076,2806,7524,20020,
 54744,148417,410078,1126732,3144500,8728570,
 24555900,68713420,194469616,548088278,1559301428,
 4418131108,12628267512,35957541462,103150588492,
 294924202032,848878072440,2435729999665]