Sums of antidiagonals of number array A103209.

Terms

a(0) =1a(1) =2a(2) =4a(3) =11a(4) =43a(5) =218a(6) =1336a(7) =9557a(8) =78053a(9) =714578a(10) =7223548a(11) =79704015a(12) =951626175a(13) =12210506762a(14) =167413540912