Central terms of the triangle in A102413.

Terms

a(0) =1a(1) =4a(2) =16a(3) =76a(4) =384a(5) =2004a(6) =10672a(7) =57628a(8) =314368a(9) =1728292a(10) =9560016a(11) =53144172a(12) =296642688a(13) =1661529588a(14) =9333781872a(15) =52566230076a(16) =296697618432