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A264927 as a simple table

na(n)
01
11
24
318
481
5396
61936
79416
845796
9234972
101205604
116188328
1231764496
13162249168
14828748944
154224034452
1621529399441
17113085801048
18593996986944
193126735424128
2016458794619136
2186717178000000
22456890625000000
232407551579000000
2412686416153856064
2566648950832253248
26350144800010358336
271838080630013808960
289648980656951105600
2950559912359694495680

[1,1,4,18,81,396,1936,9416,45796,234972,1205604,
 6188328,31764496,162249168,828748944,4224034452,
 21529399441,113085801048,593996986944,
 3126735424128,16458794619136,86717178000000,
 456890625000000,2407551579000000,
 12686416153856064,66648950832253248,
 350144800010358336,1838080630013808960,
 9648980656951105600,50559912359694495680]