Row sums of number triangle related to the Jacobsthal numbers.

Terms

a(0) =1a(1) =0a(2) =-5a(3) =-14a(4) =-27a(5) =-44a(6) =-65a(7) =-90a(8) =-119a(9) =-152a(10) =-189a(11) =-230a(12) =-275a(13) =-324a(14) =-377a(15) =-434a(16) =-495a(17) =-560a(18) =-629a(19) =-702a(20) =-779a(21) =-860a(22) =-945a(23) =-1034a(24) =-1127a(25) =-1224a(26) =-1325a(27) =-1430a(28) =-1539a(29) =-1652