A046549 - OEIS

A046549

First numerator and then denominator of the elements to the right of the central elements of the 1/3-Pascal triangle (by row), excluding 1's and 3's.

%I #13 Apr 13 2021 20:43:39

%S 4,7,5,10,25,13,55,38,16,31,18,19,203,49,73,22,350,220,95,25,252,190,

%T 105,40,28,442,295,145,148,31,946,737,440,583,179,34,1683,1177,1903,

%U 254,71,37,3575,2860,5434,2665,325,250,40,6435,14014,8099,3640,1225,290

%N First numerator and then denominator of the elements to the right of the central elements of the 1/3-Pascal triangle (by row), excluding 1's and 3's.

%e 1/1; -->

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

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

%e 1/1 4/3 4/3 1/1; --> 4

%e 1/1 7/3 8/3 7/3 1/1; --> 7

%e 1/1 10/3 5/1 5/1 10/3 1/1; --> 5 10

%e 1/1 13/3 25/3 10/1 25/3 13/3 1/1; --> ...

%e 1/1 16/3 38/3 55/3 55/3 38/3 16/3 1/1; ...

%Y Cf. A046534.

%K tabf,nonn,frac,less

%O 1,1

%A _Mohammad K. Azarian_

%E Corrected and extended by _Sean A. Irvine_, Apr 13 2021