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A055490 as a simple table

na(n)
15
223
3719
45039
5479001599
687178291199
7265252859812191058636308479999999
8263130836933693530167218012159999999
98683317618811886495518194401279999999

[5,23,719,5039,479001599,87178291199,
 265252859812191058636308479999999,
 263130836933693530167218012159999999,
 8683317618811886495518194401279999999]