a(n) = - a(n-1) + 5(a(n-2) + a(n-3)) - 2(a(n-4) + a(n-5)) - 8(a(n-6) + a(n-7)).

Terms

a(0) =0a(1) =1a(2) =1a(3) =3a(4) =3a(5) =8a(6) =12a(7) =27a(8) =45a(9) =96a(10) =176a(11) =363a(12) =693a(13) =1408a(14) =2752a(15) =5547a(16) =10965a(17) =22016a(18) =43776a(19) =87723a(20) =174933a(21) =350208a(22) =699392a(23) =1399467a(24) =2796885a(25) =5595136a(26) =11186176a(27) =22375083a(28) =44741973a(29) =89489408