A046531 Numerators of elements to right of central elements of 1/2-Pascal triangle (by row).
1, 1, 3, 1, 5, 1, 11, 7, 1, 9, 9, 1, 20, 27, 11, 1, 67, 19, 13, 1, 147, 105, 51, 15, 1, 126, 78, 33, 17, 1, 273, 204, 111, 83, 19, 1, 477, 315, 305, 51, 21, 1, 1023, 792, 935, 407, 123, 23, 1, 1815, 2519, 671, 265, 73, 25, 1, 3861, 6149, 3861, 936, 338, 171
Offset: 1
Examples
1/1; 1/1 1/1; --> 1 1/1 1/2 1/1; --> 1 1/1 3/2 3/2 1/1; --> 3 1 1/1 5/2 3/1 5/2 1/1; --> 5 1 1/1 7/2 11/2 11/2 7/2 1/1; --> 11 7 1 1/1 9/2 9/1 11/1 9/1 9/2 1/1; --> 9 9 1 1/1 11/2 27/2 20/1 20/1 27/2 11/2 1/1; --> 20 27 11 1
Links
- Thomas M. Richardson, The three 'R's and Dual Riordan Arrays, arXiv:1609.01193 [math.CO], 2016.
Extensions
More terms from Sean A. Irvine, Apr 13 2021