First term of n-th difference sequence of (floor(k*r)), r = sqrt(7), k >= 0.

Terms

a(0) =2a(1) =1a(2) =-2a(3) =4a(4) =-7a(5) =10a(6) =-10a(7) =1a(8) =26a(9) =-80a(10) =161a(11) =-242a(12) =242a(13) =1a(14) =-730a(15) =2188a(16) =-4376a(17) =6580a(18) =-6733a(19) =1140a(20) =13718a(21) =-32945a(22) =18920a(23) =158356a(24) =-851599a(25) =2896920a(26) =-8097220a(27) =20058301a(28) =-45540944a(29) =96506230