Antidiagonal sums of array A089975.

Terms

a(0) =1a(1) =1a(2) =2a(3) =4a(4) =8a(5) =20a(6) =52a(7) =146a(8) =458a(9) =1498a(10) =5240a(11) =19562a(12) =76006a(13) =311258a(14) =1334108a(15) =5931250a(16) =27492122a(17) =132096626a(18) =655783888a(19) =3368747018a(20) =17837850110a(21) =97228103482a(22) =545514383396