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First column in maze array of natural numbers A081349.
6

%I #13 Jun 18 2017 02:18:45

%S 1,2,3,4,15,16,35,36,63,64,99,100,143,144,195,196,255,256,323,324,399,

%T 400,483,484,575,576,675,676,783,784,899,900,1023,1024,1155,1156,1295,

%U 1296,1443,1444,1599,1600,1763,1764,1935,1936,2115,2116,2303,2304,2499

%N First column in maze array of natural numbers A081349.

%C Interleaves A000466 with even squares A016742.

%H Vincenzo Librandi, <a href="/A081350/b081350.txt">Table of n, a(n) for n = 0..10000</a>

%H <a href="/index/Rec#order_05">Index entries for linear recurrences with constant coefficients</a>, signature (1,2,-2,-1,1).

%F a(0)=1, a(1)=2, a(n)=(n-1)*(n+(-1)^n), n>1.

%F G.f.: -(2*x^6-10*x^4+x^3+x^2-x-1)/((1-x)^3*(1+x)^2). [_Colin Barker_, Sep 03 2012]

%Y Cf. A081351, A081352.

%K nonn,easy

%O 0,2

%A _Paul Barry_, Mar 19 2003