a(n) = (binomial(2n, n) - 2) mod n^3.

Terms

a(0) =0a(1) =4a(2) =18a(3) =4a(4) =0a(5) =58a(6) =0a(7) =68a(8) =504a(9) =754a(10) =0a(11) =1562a(12) =0a(13) =2062a(14) =2518a(15) =580a(16) =0a(17) =922a(18) =0a(19) =818a(20) =6535a(21) =7990a(22) =0a(23) =12058a(24) =250a(25) =4398a(26) =2691a(27) =10358a(28) =0a(29) =12422