A bisection of A162584.

Terms

a(0) =1a(1) =8a(2) =50a(3) =240a(4) =1024a(5) =3888a(6) =13696a(7) =44960a(8) =139970a(9) =414904a(10) =1181568a(11) =3242928a(12) =8623104a(13) =22268752a(14) =56039936a(15) =137686048a(16) =331039232a(17) =780029536a(18) =1804321074a(19) =4102056144a(20) =9177497600a(21) =20225408480a(22) =43948974720a(23) =94236510112a(24) =199549448704