Binomial(2p-1,p-1) modulo p^4, with p=prime(n).

Terms

a(0) =3a(1) =10a(2) =126a(3) =1716a(4) =1332a(5) =2198a(6) =14740a(7) =61732a(8) =158172a(9) =268280a(10) =29792a(11) =557184a(12) =2343315a(13) =2623732a(14) =3218514a(15) =5657327a(16) =11911983a(17) =12710937a(18) =7218313a(19) =12526886a(20) =24119055a(21) =18735483a(22) =13151102a(23) =19034164a(24) =87616609a(25) =86545285a(26) =2185455a(27) =80852839a(28) =137273075a(29) =106774379