a(n) = a(n-1) + 4*a(n-2) + 6*a(n-3) + 4*a(n-4) + a(n-5).

Terms

a(0) =0a(1) =1a(2) =1a(3) =2a(4) =3a(5) =21a(6) =50a(7) =161a(8) =501a(9) =1532a(10) =4723a(11) =14551a(12) =44800a(13) =137971a(14) =424901a(15) =1308512a(16) =4029693a(17) =12409831a(18) =38217250a(19) =117693681a(20) =362448951a(21) =1116196192a(22) =3437432913a(23) =10585903361a(24) =32600301650a(25) =100395746291a(26) =309178300901a(27) =952144142322