Antidiagonal sums of A059450.

Terms

a(0) =1a(1) =1a(2) =3a(3) =7a(4) =21a(5) =53a(6) =159a(7) =419a(8) =1257a(9) =3401a(10) =10203a(11) =28095a(12) =84285a(13) =235005a(14) =705015a(15) =1984155a(16) =5952465a(17) =16873745a(18) =50621235a(19) =144327287a(20) =432981861a(21) =1240296773a(22) =3720890319a(23) =10700364691a(24) =32101094073a(25) =92619680089a(26) =277859040267a(27) =803956981807