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A186751 as a simple table

na(n)
03
15
221
3437
4190965
536467631221
61329888126870853950837
71768602429992068534155014726612412013000565

[3,5,21,437,190965,36467631221,
 1329888126870853950837,
 1768602429992068534155014726612412013000565]