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A001241 as a simple table

na(n)
11
250
31660
446760
51217776
630480800
7747497920
818139003520
9437786795776
1010536798272000
11253246254177280
126082300519393280
13146028165842661376
143505313580591718400
1584135194495708938240
162019336829962040279040

[1,50,1660,46760,1217776,30480800,747497920,
 18139003520,437786795776,10536798272000,
 253246254177280,6082300519393280,
 146028165842661376,3505313580591718400,
 84135194495708938240,2019336829962040279040]