Row sums of a triangle related to the Jacobsthal polynomials.

Terms

a(0) =1a(1) =2a(2) =3a(3) =7a(4) =12a(5) =24a(6) =45a(7) =86a(8) =164a(9) =312a(10) =595a(11) =1133a(12) =2159a(13) =4113a(14) =7836a(15) =14929a(16) =28442a(17) =54187a(18) =103235a(19) =196680a(20) =374708a(21) =713881a(22) =1360062a(23) =2591144a(24) =4936560a(25) =9404967a(26) =17918025a(27) =34136815a(28) =65036305a(29) =123904968