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

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;
1/1 13/3 25/3 10/1 25/3 13/3 1/1;
1/1 16/3 38/3 55/3 55/3 38/3 16/3 1/1; ...

Crossrefs

Cf. A046534.

Sequence in context: A205126 A016623 A273100 * A233129 A035292 A144457

Adjacent sequences: A046540 A046541 A046542 * A046544 A046545 A046546

Keyword

tabf,nonn,frac

Author

Mohammad K. Azarian

Extensions

More terms from Sean A. Irvine, Apr 13 2021

Status

approved