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A147061 as a simple table

na(n)
11
21
31
41
55
61
710
81
926
101
11220
1225
131716
14153
1523943
161076
17485243
1813889
1910665112
20185108
21364094762
224253039
2318497655767
24156271576
251302420306077
267383352471

[1,1,1,1,5,1,10,1,26,1,220,25,1716,153,23943,1076,
 485243,13889,10665112,185108,364094762,4253039,
 18497655767,156271576,1302420306077,7383352471]