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A101904 as a simple table

na(n)
11
26
321
470
5223
6706
72235
87070
922360
1070710
11223606
12707106
132236067
147071067
1522360679
1670710677
17223606797
18707106780
192236067976
207071067811
2122360679774
2270710678118
23223606797749
24707106781186
252236067977499

[1,6,21,70,223,706,2235,7070,22360,70710,223606,
 707106,2236067,7071067,22360679,70710677,
 223606797,707106780,2236067976,7071067811,
 22360679774,70710678118,223606797749,707106781186,
 2236067977499]