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A271599 as a simple table

na(n)
01
15
220
365
4225
5796
63220
711880
847172
9188004
10747464
112982848
1211909008
1347634836
14190514480
15761884472

[1,5,20,65,225,796,3220,11880,47172,188004,747464,
 2982848,11909008,47634836,190514480,761884472]