%I #16 Jan 25 2020 01:31:24
%S 1,1,4,7,39,69,386,683,3821,6761,37824,66927,374419,662509,3706366,
%T 6558163,36689241,64919121,363186044,642633047,3595171199,6361411349,
%U 35588525946,62971480443,352290088261,623353393081,3487312356664
%N a(0)=a(1)=1, a(2)=4, a(3)=7, a(n+4) = 10*a(n+2) - a(n).
%H <a href="/index/Rec#order_04">Index entries for linear recurrences with constant coefficients</a>, signature (0,10,0,-1).
%F G.f.: (1 + x - 6*x^2 - 3*x^3)/(1 - 10*x^2 + x^4). - _Philippe Deléham_ and _R. J. Mathar_, Dec 04 2008
%K easy,nonn
%O 0,3
%A _Richard Choulet_, Dec 04 2008