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A007297 as a simple table

na(n)
11
21
34
423
5156
61162
79192
875819
9644908
105616182
1149826712
12448771622
134092553752
1437714212564
15350658882768
163285490743987
1730989950019532
18294031964658430
192804331954047160
2026870823304476690
21258548658860327880

[1,1,4,23,156,1162,9192,75819,644908,5616182,
 49826712,448771622,4092553752,37714212564,
 350658882768,3285490743987,30989950019532,
 294031964658430,2804331954047160,
 26870823304476690,258548658860327880]