A046531 - OEIS

%I #15 Apr 13 2021 19:24:51

%S 1,1,3,1,5,1,11,7,1,9,9,1,20,27,11,1,67,19,13,1,147,105,51,15,1,126,

%T 78,33,17,1,273,204,111,83,19,1,477,315,305,51,21,1,1023,792,935,407,

%U 123,23,1,1815,2519,671,265,73,25,1,3861,6149,3861,936,338,171

%N Numerators of elements to right of central elements of 1/2-Pascal triangle (by row).

%H Thomas M. Richardson, <a href="http://arxiv.org/abs/1609.01193">The three 'R's and Dual Riordan Arrays</a>, arXiv:1609.01193 [math.CO], 2016.

%e 1/1;

%e 1/1 1/1;                               -->  1

%e 1/1 1/2 1/1;                           -->  1

%e 1/1 3/2 3/2 1/1;                       -->  3  1

%e 1/1 5/2 3/1 5/2 1/1;                   -->  5  1

%e 1/1 7/2 11/2 11/2 7/2 1/1;             --> 11  7 1

%e 1/1 9/2 9/1 11/1 9/1 9/2 1/1;          -->  9  9 1

%e 1/1 11/2 27/2 20/1 20/1 27/2 11/2 1/1; --> 20 27 11 1

%Y Cf. A046213, A046226.

%K tabf,nonn,less

%O 1,3

%A _Mohammad K. Azarian_

%E More terms from _Sean A. Irvine_, Apr 13 2021