Sums of antidiagonals of A321964.

Terms

a(0) =1a(1) =1a(2) =2a(3) =6a(4) =29a(5) =205a(6) =1900a(7) =21592a(8) =289325a(9) =4456773a(10) =77512394a(11) =1501537750a(12) =32053808641a(13) =747561173689