Coefficients in the expansion of 1/([r] + [2r]x + [3r]x^2 + ...); [ ] = floor, r = Pi/2.

Terms

a(0) =1a(1) =-3a(2) =5a(3) =-9a(4) =18a(5) =-36a(6) =72a(7) =-144a(8) =287a(9) =-570a(10) =1132a(11) =-2250a(12) =4473a(13) =-8892a(14) =17676a(15) =-35137a(16) =69847a(17) =-138845a(18) =276002a(19) =-548649a(20) =1090629a(21) =-2168001a(22) =4309649a(23) =-8566912a(24) =17029689a(25) =-33852374a(26) =67293256a(27) =-133768530a(28) =265911039a(29) =-528589801