a(n) = T(2n+5,n), array T as in A055807.

Terms

a(0) =1a(1) =63a(2) =448a(3) =2816a(4) =16896a(5) =99200a(6) =575872a(7) =3322112a(8) =19096064a(9) =109541824a(10) =627653440a(11) =3594256896a(12) =20577979392a(13) =117814911744a(14) =674630384384