login

Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.

A253268 as a simple table

na(n)
11
21
38
4648
52025000
6530841600000
733309523161907200000
81259861409934788058133299200000
976494996113757662751632456649087438028800000
1019375812441937279261781767910157290423127539712000000000000000

[1,1,8,648,2025000,530841600000,
 33309523161907200000,
 1259861409934788058133299200000,
 76494996113757662751632456649087438028800000,
 19375812441937279261781767910157290423127539712000\
 000000000000]