login

A355990 as a simple table

na(n)
31
44
520
660
7420
83360
910080
10100800
111108800
123326400
1343243200
14605404800
151816214400
1629059430400
17494010316800
181482030950400
1928158588057600
20563171761152000
211689515283456000
2237169336236032000
23854894733428736000
242564684200286208000

[1,4,20,60,420,3360,10080,100800,1108800,3326400,
 43243200,605404800,1816214400,29059430400,
 494010316800,1482030950400,28158588057600,
 563171761152000,1689515283456000,
 37169336236032000,854894733428736000,
 2564684200286208000]