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A015564 as a simple table

na(n)
00
11
27
355
4427
53319
625795
7200479
81558123
912109735
1094116883
11731476591
125685037435
1344184121591
14343399075747
152668898259775
1620742682272907
17161212165468999
181252941251920435
199737861756257039
2075682679805321883

[0,1,7,55,427,3319,25795,200479,1558123,12109735,
 94116883,731476591,5685037435,44184121591,
 343399075747,2668898259775,20742682272907,
 161212165468999,1252941251920435,9737861756257039,
 75682679805321883]