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

Terms

a(0) =0a(1) =1a(2) =1a(3) =2a(4) =3a(5) =11a(6) =12a(7) =55a(8) =55a(9) =266a(10) =261a(11) =1277a(12) =1248a(13) =6121a(14) =5977a(15) =29330a(16) =28635a(17) =140531a(18) =137196a(19) =673327a(20) =657343a(21) =3226106a(22) =3149517a(23) =15457205a(24) =15090240a(25) =74059921a(26) =72301681a(27) =354842402a(28) =346418163a(29) =1700152091