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A001246 as a simple table

na(n)
01
11
24
325
4196
51764
617424
7184041
82044900
923639044
10282105616
113455793796
1243268992144
13551900410000
147152629313600
1593990019574025
161250164827828900
1716807771574144100
18228138727737690000
193123219182728976100
2043087676888260976400
21598598221893939680400
228369059450146650049600

[1,1,4,25,196,1764,17424,184041,2044900,23639044,
 282105616,3455793796,43268992144,551900410000,
 7152629313600,93990019574025,1250164827828900,
 16807771574144100,228138727737690000,
 3123219182728976100,43087676888260976400,
 598598221893939680400,8369059450146650049600]