Row sums of generalized rhombic triangle A164585.

Terms

a(0) =1a(1) =1a(2) =3a(3) =8a(4) =19a(5) =51a(6) =134a(7) =354a(8) =952a(9) =2558a(10) =6917a(11) =18787a(12) =51146a(13) =139702a(14) =382464a(15) =1049221a(16) =2883964a(17) =7939822a(18) =21891635a(19) =60440322a(20) =167068352a(21) =462315544a(22) =1280607173a(23) =3550505517a(24) =9852130198a(25) =27359426032a(26) =76031905038a(27) =211433821121a(28) =588332188162