Sum of terms in 'rows' of A178746.

Terms

a(0) =1a(1) =3a(2) =19a(3) =65a(4) =295a(5) =1129a(6) =4663a(7) =18441a(8) =74359a(9) =296585a(10) =1188727a(11) =4751497a(12) =19015543a(13) =76048521a(14) =304232311a(15) =1216874633a(16) =4867651447a(17) =19470387337a(18) =77882161015a(19) =311527770249