First term of n-th difference sequence of (floor(Pi*k/4)), k >= 0.

Terms

a(0) =0a(1) =1a(2) =-1a(3) =1a(4) =-2a(5) =6a(6) =-16a(7) =36a(8) =-71a(9) =126a(10) =-201a(11) =276a(12) =-276a(13) =0a(14) =1014a(15) =-3744a(16) =10179a(17) =-24309a(18) =54126a(19) =-115614a(20) =240444a(21) =-490104a(22) =980209a(23) =-1918752a(24) =3658449a(25) =-6750224a(26) =11950524a(27) =-20058300a(28) =31303782a(29) =-43733304