s(k)-s(j), where (k,j) is the least pair for which n divides s(k)-s(j), and s(j)=(1/2)C(2j,j).

Terms

a(0) =2a(1) =2a(2) =9a(3) =32a(4) =25a(5) =336a(6) =7a(7) =32a(8) =9a(9) =1590a(10) =1254a(11) =336a(12) =91a(13) =336a(14) =1590a(15) =32a(16) =34a(17) =24300a(18) =1254a(19) =6400a(20) =336a(21) =1254a(22) =92368a(23) =336a(24) =25a(25) =22594a(26) =459a(27) =336a(28) =116a(29) =1590