Secondary diagonal of triangle A127496: a(n) = A127496(n+1,n) for n>=0.

Terms

a(0) =1a(1) =2a(2) =5a(3) =16a(4) =53a(5) =186a(6) =672a(7) =2465a(8) =9158a(9) =34354a(10) =129833a(11) =493534a(12) =1884955a(13) =7227522a(14) =27804584a(15) =107268790a(16) =414852381a(17) =1607836478a(18) =6243201267a(19) =24282747900a(20) =94587991975a(21) =368940451638