Alternating row sums of A257241, Stifel's version of the arithmetical triangle.

Terms

a(0) =1a(1) =2a(2) =0a(3) =-2a(4) =5a(5) =11a(6) =-14a(7) =-34a(8) =57a(9) =127a(10) =-209a(11) =-461a(12) =793a(13) =1717a(14) =-3002a(15) =-6434a(16) =11441a(17) =24311a(18) =-43757a(19) =-92377a(20) =167961a(21) =352717a(22) =-646645a(23) =-1352077a(24) =2496145a(25) =5200301a(26) =-9657699a(27) =-20058299a(28) =37442161a(29) =77558761