A370174 Triangle read by rows: Riordan array (1/(1 - x), x*(1 + x)/(1 - x - x^2)).
1, 1, 1, 1, 3, 1, 1, 6, 5, 1, 1, 11, 15, 7, 1, 1, 19, 37, 28, 9, 1, 1, 32, 82, 87, 45, 11, 1, 1, 53, 170, 234, 169, 66, 13, 1, 1, 87, 337, 573, 535, 291, 91, 15, 1, 1, 142, 647, 1314, 1511, 1061, 461, 120, 17, 1, 1, 231, 1213, 2871, 3933, 3398, 1904, 687, 153, 19, 1
Offset: 0
Examples
Triangle T(n,k) begins:
k=0 1 2 3 4 5 6
n=0: 1;
n=1: 1, 1;
n=2: 1, 3, 1;
n=3: 1, 6, 5, 1;
n=4: 1, 11, 15, 7, 1;
n=5: 1, 19, 37, 28, 9, 1;
n=6: 1, 32, 82, 87, 45, 11, 1;
...
87 = 28 + 37 + 7 + 15.