Limits of diagonals in triangle defined in A061260.

Terms

a(0) =1a(1) =2a(2) =6a(3) =15a(4) =37a(5) =85a(6) =194a(7) =423a(8) =912a(9) =1917a(10) =3974a(11) =8096a(12) =16302a(13) =32382a(14) =63668a(15) =123851a(16) =238756a(17) =456190a(18) =864821a(19) =1627016a(20) =3039845a(21) =5641884a(22) =10406924a(23) =19083836a(24) =34802782a(25) =63135539a(26) =113965033a(27) =204739662a(28) =366156396a(29) =652001918