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A017686 as a simple table

na(n)
11
22048
3177147
44194304
548828125
630233088
71977326743
88589934592
931381059609
1050000000000
11285311670611
12185752092672
131792160394037
14506195646208
152883251953125
1617592186044416
1734271896307633

[1,2048,177147,4194304,48828125,30233088,
 1977326743,8589934592,31381059609,50000000000,
 285311670611,185752092672,1792160394037,
 506195646208,2883251953125,17592186044416,
 34271896307633]