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A215990 as a simple table

na(n)
00
11
21
37
413
57
673
7461
81721
97391
1035741
1195833
12140902
137208291
146221977
15738064507
165846167507
1749265043007
18440034922507
194152348777757
2041275487330257
21431068442131507
224718790944945257
2327013799863651691
24322866652557800441
25502628413904332477

[0,1,1,7,13,7,73,461,1721,7391,35741,95833,140902,
 7208291,6221977,738064507,5846167507,49265043007,
 440034922507,4152348777757,41275487330257,
 431068442131507,4718790944945257,
 27013799863651691,322866652557800441,
 502628413904332477]