Alternating row sums of Riordan triangle A321198.

Terms

a(0) =1a(1) =-1a(2) =2a(3) =-4a(4) =8a(5) =-18a(6) =39a(7) =-89a(8) =204a(9) =-472a(10) =1110a(11) =-2616a(12) =6231a(13) =-14909a(14) =35861a(15) =-86705a(16) =210364a(17) =-512480a(18) =1252350a(19) =-3069638a(20) =7544818a(21) =-18589202a(22) =45907708a(23) =-113608590a(24) =281698359a(25) =-699748003a(26) =1741102844a(27) =-4338995332a(28) =10828981851a(29) =-27063384783