Antidiagonal sums of the array A028412.

Terms

a(0) =1a(1) =2a(2) =6a(3) =16a(4) =51a(5) =195a(6) =932a(7) =5651a(8) =43641a(9) =428905a(10) =5362388a(11) =85303080a(12) =1726416461a(13) =44444215422