Row sums of A281348.

Terms

a(0) =1a(1) =3a(2) =8a(3) =27a(4) =90a(5) =330a(6) =1225a(7) =4729a(8) =18554a(9) =74234a(10) =300828a(11) =1233992a(12) =5110067a(13) =21341337a(14) =89768701a(15) =379995230a(16) =1617476520a(17) =6918987187a(18) =29727655820a(19) =128233521698a(20) =555136090343