Triangle, real terms extracted from squares of paired terms in arithmetic sequences.

Terms

a(0) =-3a(1) =-8a(2) =-5a(3) =-15a(4) =-16a(5) =-7a(6) =-24a(7) =-33a(8) =-24a(9) =-9a(10) =-35a(11) =-56a(12) =-51a(13) =-32a(14) =-11a(15) =-48a(16) =-85a(17) =-88a(18) =-69a(19) =-40a(20) =-13a(21) =-63a(22) =-120a(23) =-135a(24) =-120a(25) =-87a(26) =-48a(27) =-15a(28) =-80a(29) =-161