%I #4 Jun 03 2019 19:47:53
%S 1,0,1,-3,6,-9,9,0,-27,81,-162,243,-243,1,714,-2067,3695,-3519,-4896,
%T 37621,-129999,352716,-836111,1802901,-3605802,6760781,-11961081,
%U 20058301,-32017846,48916881,-72174561,104394081,-151428366,226511451,-357639591,600805296
%N First term of n-th difference sequence of (floor(e*k/2)), k >= 0.
%H Clark Kimberling, <a href="/A325738/b325738.txt">Table of n, a(n) for n = 1..200</a>
%t Table[First[Differences[Table[Floor[(E/2)*n], {n, 0, 50}], n]], {n, 1, 50}]
%Y Cf. A325664.
%K easy,sign
%O 1,4
%A _Clark Kimberling_, May 23 2019