Hankel transform of a simple Catalan convolution.

Terms

a(0) =1a(1) =-1a(2) =-11a(3) =-50a(4) =-186a(5) =-631a(6) =-2029a(7) =-6299a(8) =-19075a(9) =-56704a(10) =-166164a(11) =-481391a(12) =-1381691a(13) =-3935125a(14) =-11134331a(15) =-31328366a(16) =-87721614a(17) =-244588519a(18) =-679429225a(19) =-1881102959a(20) =-5192705779a(21) =-14296088956a(22) =-39263958696a(23) =-107601905375a(24) =-294291714551a(25) =-803416991401