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A354577 Variant of A253028 using only even numbers: a mirror symmetric array of even numbers where the n-th term is equal to the number of terms in the n-th row of the array.

%I A354577 #8 Jun 22 2022 21:04:11
%S A354577 2,4,6,2,4,8,10,6,2,4,8,12,14,16,18,10,12,20,22,14,6,2,4,8,16,24,26,
%T A354577 18,10,6,2,4,8,12,20,28,30,22,14,16,24,32,34,36,38,26,28,40,42,30,18,
%U A354577 10,12,20,32,44,46,34,22,14,6,2,4,8,16,24,36,48,50,38,26
%N A354577 Variant of A253028 using only even numbers: a mirror symmetric array of even numbers where the n-th term is equal to the number of terms in the n-th row of the array.
%C A354577 See the examples in A253028 for a detailed illustration of how the array is constructed.
%H A354577 Rémy Sigrist, <a href="/A354577/a354577.gp.txt">PARI program</a>
%e A354577 1.........................2,4
%e A354577 2.......................6,2,4,8
%e A354577 3....................10,6,2,4,8,12
%e A354577 4........................14,16
%e A354577 5.....................18,10,12,20
%e A354577 6.................22,14,6,2,4,8,16,24
%e A354577 7..............26,18,10,6,2,4,8,12,20,28
%e A354577 8..................30,22,14,16,24,32
%e A354577 9........................34,36
%e A354577 10....................38,26,28,40
%e A354577 11..............42,30,18,10,12,20,32,44
%e A354577 12..........46,34,22,14,6,2,4,8,16,24,36,48
%e A354577 13.......50,38,26,18,10,6,2,4,8,12,20,28,40,52
%o A354577 (PARI) See Links section.
%Y A354577 Cf. A253028, A354576.
%K A354577 nonn,tabf
%O A354577 1,1
%A A354577 _Felix Fröhlich_, May 30 2022