A quadrisection of 1/(1-x-x^5).

Terms

a(0) =1a(1) =1a(2) =5a(3) =15a(4) =45a(5) =140a(6) =431a(7) =1326a(8) =4085a(9) =12580a(10) =38740a(11) =119305a(12) =367411a(13) =1131476a(14) =3484490a(15) =10730820a(16) =33046585a(17) =101770120a(18) =313410816a(19) =965178576a(20) =2972359720a(21) =9153665985a(22) =28189589705a(23) =86812537085a(24) =267347509271a(25) =823322219501