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A176648 as a simple table

na(n)
01
15
213
355
4245
51215
66317
734187
8190093
91079983
106239989
1136554363
12216600357
131295906671
147817665373
1547499325915
16290411653437
171785401003887
1811030252590149
1968444469966843
20426386709191893
212665740642304879

[1,5,13,55,245,1215,6317,34187,190093,1079983,
 6239989,36554363,216600357,1295906671,7817665373,
 47499325915,290411653437,1785401003887,
 11030252590149,68444469966843,426386709191893,
 2665740642304879]