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.

4, 7, 5, 10, 25, 13, 55, 38, 16, 31, 18, 19, 203, 49, 73, 22, 350, 220, 95, 25, 252, 190, 105, 40, 28, 442, 295, 145, 148, 31, 946, 737, 440, 583, 179, 34, 1683, 1177, 1903, 254, 71, 37, 3575, 2860, 5434, 2665, 325, 250, 40, 6435, 14014, 8099, 3640, 1225, 290

Offset

1,1

Links

Table of n, a(n) for n=1..55.

Example

1/1; -->
1/1 1/1; -->
1/1 1/3 1/1; -->
1/1 4/3 4/3 1/1; --> 4
1/1 7/3 8/3 7/3 1/1; --> 7
1/1 10/3 5/1 5/1 10/3 1/1; --> 5 10
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: A248932 A341672 A346836 * A331138 A051544 A271304

Adjacent sequences: A046546 A046547 A046548 * A046550 A046551 A046552

Keyword

tabf,nonn,frac,less

Author

Mohammad K. Azarian

Extensions

Corrected and extended by Sean A. Irvine, Apr 13 2021

Status

approved