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A001566 as a simple table

na(n)
03
17
247
32207
44870847
523725150497407
6562882766124611619513723647
7316837008400094222150776738483768236006420971486980607

[3,7,47,2207,4870847,23725150497407,
 562882766124611619513723647,
 31683700840009422215077673848376823600642097148698\
 0607]