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A209523 as a simple table

na(n)
115
2700
3107693
427323948
59700576474
64194606038254
72002617518101082
8999998646599976052
9509185650061380676984
10261448697342101358568952
11134726519599100535344614118
1269532388907494477391456512054

[15,700,107693,27323948,9700576474,4194606038254,
 2002617518101082,999998646599976052,
 509185650061380676984,261448697342101358568952,
 134726519599100535344614118,
 69532388907494477391456512054]