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A088067 as a simple table

na(n)
12
249
34913
4161638253018845201
53039570296881249
61139375455639725601277890624
7528398289001625555528682909170420863

[2,49,4913,161638253018845201,3039570296881249,
 1139375455639725601277890624,
 528398289001625555528682909170420863]