Symmetrical sequence:Binomial(n,5*m).

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =252a(5) =1a(6) =1a(7) =3003a(8) =3003a(9) =1a(10) =1a(11) =15504a(12) =184756a(13) =15504a(14) =1a(15) =1a(16) =53130a(17) =3268760a(18) =3268760a(19) =53130a(20) =1a(21) =1a(22) =142506a(23) =30045015a(24) =155117520a(25) =30045015a(26) =142506a(27) =1a(28) =1a(29) =324632