a(n) = A134955(n) - A134955(n-2).

Terms

a(0) =1a(1) =1a(2) =3a(3) =7a(4) =16a(5) =41a(6) =108a(7) =301a(8) =881a(9) =2684a(10) =8455a(11) =27444a(12) =91248a(13) =309593a(14) =1068584a(15) =3742171a(16) =13269281a(17) =47561455a(18) =172092274a(19) =627887239a(20) =2307902495a(21) =8539497952a(22) =31786480760a(23) =118960956585a(24) =447413177185