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A272810 as a simple table

na(n)
01
15
221
353
4173
5865
64029
716637
865381
9262577
101043025
114111721
1216309705
1364954017
14259236073
151035773481

[1,5,21,53,173,865,4029,16637,65381,262577,
 1043025,4111721,16309705,64954017,259236073,
 1035773481]