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A145502 as a simple table

na(n)
12
26
346
42206
54870846
623725150497406
7562882766124611619513723646
8316837008400094222150776738483768236006420971486980606

[2,6,46,2206,4870846,23725150497406,
 562882766124611619513723646,
 31683700840009422215077673848376823600642097148698\
 0606]