a(n) = -A292140(n)/2.

Terms

a(0) =1a(1) =1a(2) =1a(3) =-3a(4) =-3a(5) =-7a(6) =-11a(7) =-15a(8) =-19a(9) =-27a(10) =-15a(11) =-23a(12) =-15a(13) =-7a(14) =17a(15) =37a(16) =77a(17) =113a(18) =181a(19) =249a(20) =349a(21) =381a(22) =529a(23) =609a(24) =737a(25) =817a(26) =945a(27) =957a(28) =1037a(29) =1001