First term of n-th difference sequence of (floor(k*r)), r = sqrt(1/3), k >= 0.

Terms

a(0) =0a(1) =1a(2) =-2a(3) =4a(4) =-8a(5) =16a(6) =-31a(7) =56a(8) =-91a(9) =126a(10) =-126a(11) =0a(12) =462a(13) =-1715a(14) =4704a(15) =-11319a(16) =25186a(17) =-52920a(18) =105840a(19) =-201684a(20) =364609a(21) =-618772a(22) =964173a(23) =-1309574a(24) =1309574a(25) =1a(26) =-4970097a(27) =18874639a(28) =-52835258a(29) =129107566