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A147218 as a simple table

na(n)
11
21
31
41
51
61
717
827
9575
101091
1110073
1226275
13436817
141241759
1599221321
16359430255
1757329770665
18261948614931
1943007975306403
20238557155162155
2161726897724737383

[1,1,1,1,1,1,17,27,575,1091,10073,26275,436817,
 1241759,99221321,359430255,57329770665,
 261948614931,43007975306403,238557155162155,
 61726897724737383]