Antidiagonal sums of square array A124389.

Terms

a(0) =1a(1) =2a(2) =3a(3) =4a(4) =7a(5) =12a(6) =23a(7) =46a(8) =97a(9) =212a(10) =481a(11) =1124a(12) =2705a(13) =6682a(14) =16919a(15) =43840a(16) =116087a(17) =313764a(18) =864683a(19) =2427306a(20) =6934769a(21) =20148124a(22) =59486997a(23) =178364624a(24) =542790609a(25) =1675526482a(26) =5243746235a(27) =16630136364a(28) =53422028679a(29) =173754047228