Alternating sum of diagonals in A060177.

Terms

a(0) =1a(1) =-1a(2) =-2a(3) =-1a(4) =-1a(5) =3a(6) =1a(7) =7a(8) =4a(9) =4a(10) =4a(11) =2a(12) =-9a(13) =-7a(14) =-7a(15) =-28a(16) =-17a(17) =-25a(18) =-15a(19) =-24a(20) =-11a(21) =-8a(22) =34a(23) =19a(24) =53a(25) =46a(26) =108a(27) =110a(28) =106a(29) =113