A046543 - OEIS

A046543

First numerator and then denominator of the central elements of the 1/3-Pascal triangle (by row).

1, 1, 1, 3, 8, 3, 10, 1, 110, 3, 406, 3, 504, 1, 1892, 1, 7150, 1, 27170, 1, 311168, 3, 1192516, 3, 1528436, 1, 17681020, 3, 68346800, 3, 88256520, 1, 342551190, 1, 1331805570, 1, 5185791600, 1, 20220038300, 1, 78937755820, 1, 308513659740, 1, 1207002506320, 1

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OFFSET

1,4

LINKS

Table of n, a(n) for n=1..46.

EXAMPLE

1/1; --> 1 1

1/1 1/1; -->

1/1 1/3 1/1; --> 1 3

1/1 4/3 4/3 1/1; -->

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

1/1 10/3 5/1 5/1 10/3 1/1;