First term of n-th difference sequence of (floor(Pi*k/2)), k >= 0.

Terms

a(0) =1a(1) =1a(2) =-2a(3) =4a(4) =-8a(5) =16a(6) =-32a(7) =64a(8) =-127a(9) =246a(10) =-456a(11) =792a(12) =-1254a(13) =1716a(14) =-1716a(15) =1a(16) =6418a(17) =-24156a(18) =67080a(19) =-162924a(20) =364608a(21) =-767976a(22) =1535953a(23) =-2922702a(24) =5273624a(25) =-8934120a(26) =13904190a(27) =-18874260a(28) =18874260a(29) =1