Antidiagonal sums of rectangular table A124530.

Terms

a(0) =1a(1) =2a(2) =3a(3) =5a(4) =11a(5) =33a(6) =125a(7) =551a(8) =2695a(9) =14258a(10) =80343a(11) =477161a(12) =2964299a(13) =19155014a(14) =128203704a(15) =885830074a(16) =6302476880a(17) =46077527307a(18) =345590801495