a(n) = period of the sequence {b(m), m>=0}, defined by b(m):=binomial(m+n,n) mod n.

Terms

a(0) =1a(1) =4a(2) =9a(3) =16a(4) =25a(5) =72a(6) =49a(7) =64a(8) =81a(9) =400a(10) =121a(11) =864a(12) =169a(13) =784a(14) =675a(15) =256a(16) =289a(17) =2592a(18) =361a(19) =1600a(20) =1323a(21) =3872a(22) =529a(23) =3456a(24) =625a(25) =5408a(26) =729a(27) =3136a(28) =841a(29) =324000