Antidiagonal sums of A366858.

Terms

a(0) =0a(1) =1a(2) =3a(3) =9a(4) =28a(5) =95a(6) =353a(7) =1435a(8) =6340a(9) =30205a(10) =154059a(11) =836181a(12) =4805816a(13) =29125915a(14) =185474289a(15) =1237159447a(16) =8620179448a(17) =62589847993a(18) =472554134275