a(n) = 4*a(n-1)-3*a(n-2) -3*a(n-3) +2*a(n-4) + a(n-5), n>7.

Terms

a(0) =4a(1) =3a(2) =9a(3) =17a(4) =40a(5) =92a(6) =215a(7) =506a(8) =1200a(9) =2861a(10) =6848a(11) =16436a(12) =39523a(13) =95162a(14) =229328a(15) =552977a(16) =1333920a(17) =3218612a(18) =7767575a(19) =18747986a(20) =45254200a(21) =109241261a(22) =263712248a(23) =636626156a(24) =1536900483a(25) =3710323442