Next-to-last diagonal of A024462.

Terms

a(0) =1a(1) =2a(2) =7a(3) =24a(4) =81a(5) =270a(6) =891a(7) =2916a(8) =9477a(9) =30618a(10) =98415a(11) =314928a(12) =1003833a(13) =3188646a(14) =10097379a(15) =31886460a(16) =100442349a(17) =315675954a(18) =990074583a(19) =3099363912a(20) =9685512225a(21) =30218798142a(22) =94143178827a(23) =292889889684a(24) =910050728661