Antidiagonal sums of array A089900.

Terms

a(0) =1a(1) =3a(2) =10a(3) =40a(4) =193a(5) =1107a(6) =7412a(7) =56960a(8) =495055a(9) =4805327a(10) =51540462a(11) =605360184a(12) =7726837413a(13) =106484488843