Row sums of triangle A064879.

Terms

a(0) =1a(1) =2a(2) =2a(3) =4a(4) =11a(5) =50a(6) =389a(7) =4590a(8) =73950a(9) =1559648a(10) =41768100a(11) =1372257648a(12) =53854228438