OFFSET
0,4
COMMENTS
Riordan array (1/sqrt(1-2*x-3*x^2), (1+x-sqrt(1-2*x-3*x^2))/(2*sqrt(1-2*x-3*x^2)). - Philippe Deléham, Mar 06 2013
FORMULA
EXAMPLE
Triangle begins:
1;
1, 1;
3, 3, 1;
7, 10, 5, 1;
19, 31, 21, 7, 1;
51, 96, 79, 36, 9, 1;
141, 294, 282, 159, 55, 11, 1;
393, 897, 972, 645, 279, 78, 13, 1;
1107, 2727, 3273, 2475, 1269, 447, 105, 15, 1;
3139, 8272, 10835, 9136, 5369, 2254, 671, 136, 17, 1; ...
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
Philippe Deléham, Apr 01 2007
STATUS
approved