Row sums of triangle in A287879, divided by 2.

Terms

a(0) =1a(1) =3a(2) =7a(3) =25a(4) =61a(5) =219a(6) =547a(7) =1937a(8) =4921a(9) =17203a(10) =44287a(11) =153193a(12) =398581a(13) =1366795a(14) =3587227a(15) =12211873a(16) =32285041a(17) =109226595a(18) =290565367a(19) =977773625a(20) =2615088301a(21) =8758657339a(22) =23535794707a(23) =78500250929a(24) =211822152361a(25) =703877909907