A046554 First denominator and then numerator of each element to the right of the central elements of the 1/3-Pascal triangle (by row), excluding 3's.

1, 1, 1, 1, 4, 1, 1, 7, 1, 1, 1, 5, 10, 1, 1, 25, 13, 1, 1, 55, 38, 16, 1, 1, 1, 31, 1, 18, 19, 1, 1, 203, 1, 49, 73, 22, 1, 1, 350, 220, 95, 25, 1, 1, 1, 252, 1, 190, 1, 105, 1, 40, 28, 1, 1, 1, 442, 1, 295, 1, 145, 148, 31, 1, 1, 1, 946, 1, 737, 1, 440, 583

Offset

1,5

Links

Table of n, a(n) for n=1..72.

Example

1/1; -->
1/1  1/1; --> 1 1
1/1  1/3  1/1; --> 1 1
1/1  4/3  4/3  1/1; --> 4 1 1
1/1  7/3  8/3  7/3  1/1; --> 7 1 1
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: A208332 A075112 A202687 * A010321 A046550 A363975

Adjacent sequences: A046551 A046552 A046553 * A046555 A046556 A046557

Keyword

tabf,nonn,less

Author

Mohammad K. Azarian

Extensions

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

Status

approved