a(n) = (2*n-1)!! mod n!, where double factorial is A006882.
A232701
a(n) = (2*n-1)!! mod n!, where double factorial is A006882.
Terms
- a(0) =0a(1) =1a(2) =3a(3) =9a(4) =105a(5) =315a(6) =4095a(7) =11025a(8) =348705a(9) =1545075a(10) =17931375a(11) =93087225a(12) =3764185425a(13) =45589819275a(16) =900941666625
External references
- oeis: A232701