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A269298 Central nonzero values of A231599. 2


%S 1,2,2,4,6,8,16,28,50,100,196,388,786,1600,3280,6780,14060,29280,

%T 61232,128414,270084,569514,1203564,2548770,5407754,11493312,24465960,

%U 52157508,111342192,237985596,509275390,1091017632,2339687834,5022312654,10790564790

%N Central nonzero values of A231599.

%C Rows of A231599 whose row number is divisible by four have positive central values. a(n) is the central value of row 4n. They are also the maximal value of that row, so a(n) = A086376(4n).

%C a(1) = a(2) = 2. Apart from that the sequence is strictly increasing.

%H Alois P. Heinz, <a href="/A269298/b269298.txt">Table of n, a(n) for n = 0..250</a> (first 101 trms from Tilman Piesk)

%H Dorin Andrica, Ovidiu Bagdasar, <a href="http://hdl.handle.net/10545/623501">On some results concerning the polygonal polynomials</a>, Carpathian Journal of Mathematics (2019) Vol. 35, No. 1, 1-11.

%H Tilman Piesk, <a href="http://paste.watchduck.net/1602/A231599_centered.html">A231599 as a centered table</a> (first 11 values visible)

%F a(n) = A231599( 4n, A000217(4n)/2 ) = A086376(4n).

%e For n = 5, A231599( 4n, A000217(4n)/2 ) = A231599(20, 105) = 8, so a(5)=8.

%e For n = 5, A086376(4n) = A086376(20) = 8, so a(5)=8.

%Y Cf. A231599, A086376.

%K nonn

%O 0,2

%A _Tilman Piesk_, Feb 21 2016

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Last modified April 8 05:55 EDT 2020. Contains 333312 sequences. (Running on oeis4.)