First term of n-th difference sequence of (floor(3e*k)), k >= 0.

Terms

a(0) =8a(1) =0a(2) =0a(3) =0a(4) =0a(5) =0a(6) =1a(7) =-7a(8) =28a(9) =-84a(10) =210a(11) =-462a(12) =925a(13) =-1729a(14) =3094a(15) =-5460a(16) =9828a(17) =-18564a(18) =37128a(19) =-77519a(20) =164710a(21) =-347984a(22) =719719a(23) =-1444170a(24) =2796248a(25) =-5200299a(26) =9230104a(27) =-15459444a(28) =23888319a(29) =-32317194