A046544 First denominator and then numerator of the central elements of the 1/3-Pascal triangle (by row).

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

Offset

1,3

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; --> 3 1
1/1 4/3 4/3 1/1;
1/1 7/3 8/3 7/3 1/1; --> 3 8
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: A103279 A208910 A209760 * A011088 A352794 A276228

Adjacent sequences: A046541 A046542 A046543 * A046545 A046546 A046547

Keyword

tabf,nonn,frac,less

Author

Mohammad K. Azarian

Extensions

More terms from Sean A. Irvine, Apr 13 2021

Status

approved