login

A002894 as a simple table

na(n)
01
14
236
3400
44900
563504
6853776
711778624
8165636900
92363904400
1034134779536
11497634306624
127312459672336
13108172480360000
141609341595560000
1524061445010950400
16361297635242552100
175445717990022688400
1882358080713306090000
191249287673091590440000

[1,4,36,400,4900,63504,853776,11778624,165636900,
 2363904400,34134779536,497634306624,7312459672336,
 108172480360000,1609341595560000,
 24061445010950400,361297635242552100,
 5445717990022688400,82358080713306090000,
 1249287673091590440000]