Take alternate terms of A274088 and A274090.

Terms

a(0) =0a(1) =0a(2) =1a(3) =1a(4) =4a(5) =1a(6) =9a(7) =-1a(8) =15a(9) =-7a(10) =20a(11) =-15a(12) =23a(13) =-28a(14) =23a(15) =-43a(16) =20a(17) =-61a(18) =11a(19) =-80a(20) =-2a(21) =-100a(22) =-21a(23) =-119a(24) =-46a(25) =-137a(26) =-76a(27) =-151a(28) =-111a(29) =-162