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A276755 as a simple table

na(n)
01
11
25
365
41625
566625
64330625
7489360625
8110106140625
952961053640625
1054285079981640625
11114704374001206640625
12484625980155098056640625
134032572780870570929306640625

[1,1,5,65,1625,66625,4330625,489360625,
 110106140625,52961053640625,54285079981640625,
 114704374001206640625,484625980155098056640625,
 4032572780870570929306640625]