a(n+1) is the Hankel transform of C(n)+C(n+2), where C(n) = A000108(n).
A138269
a(n+1) is the Hankel transform of C(n)+C(n+2), where C(n) = A000108(n).
Terms
- a(0) =1a(1) =3a(2) =12a(3) =53a(4) =231a(5) =1000a(6) =4329a(7) =18747a(8) =81188a(9) =351597a(10) =1522639a(11) =6594000a(12) =28556241a(13) =123666803a(14) =535556412a(15) =2319302053a(16) =10044062391a(17) =43497219000a(18) =188370799289a(19) =815766130347
External references
- oeis: A138269