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A273688 as a simple table

na(n)
01
15
217
349
4261
51081
63993
715521
861921
9248613
10997825
113981665
1215954309
1363723117
14255045061
151019793809

[1,5,17,49,261,1081,3993,15521,61921,248613,
 997825,3981665,15954309,63723117,255045061,
 1019793809]