a(n) = (1/4)*A357287(n).

Terms

a(0) =0a(1) =0a(2) =0a(3) =0a(4) =0a(5) =0a(6) =1a(7) =2a(8) =5a(9) =12a(10) =23a(11) =42a(12) =85a(13) =144a(14) =251a(15) =454a(16) =753a(17) =1244a(18) =2183a(19) =3506a(20) =5725a(21) =9736a(22) =15539a(23) =24926a(24) =41993a(25) =66228a(26) =105823a(27) =176138a(28) =277173a(29) =439648