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A036247 as a simple table

na(n)
12
27
337
4266
52963
638785
7662308
812622637
9290982959
108451128448
11262275964847
129712661827787
13398481410904114
1417144413330704689
15806185907954024497
1642744997534894003030
172522761040466700203267

[2,7,37,266,2963,38785,662308,12622637,290982959,
 8451128448,262275964847,9712661827787,
 398481410904114,17144413330704689,
 806185907954024497,42744997534894003030,
 2522761040466700203267]