T(n,n+1), array T given by A047010.

Terms

a(0) =1a(1) =2a(2) =6a(3) =19a(4) =65a(5) =231a(6) =837a(7) =3081a(8) =11475a(9) =43105a(10) =163028a(11) =620016a(12) =2368717a(13) =9083894a(14) =34948812a(15) =134833093a(16) =521441459a(17) =2020832892a(18) =7846285977a(19) =30515284116a(20) =118854299343a(21) =463545526625