A214582 Riordan array (1/(1-x-x^2), x*(1+2*x)).
1, 1, 1, 2, 3, 1, 3, 4, 5, 1, 5, 7, 10, 7, 1, 8, 11, 15, 20, 9, 1, 13, 18, 25, 35, 34, 11, 1, 21, 29, 40, 55, 75, 52, 13, 1, 34, 47, 65, 90, 125, 143, 74, 15, 1, 55, 76, 105, 145, 200, 275, 247, 100, 17, 1
Offset: 0
Examples
Triangle begins 1 1, 1 2, 3, 1 3, 4, 5, 1 5, 7, 10, 7, 1 8, 11, 15, 20, 9, 1 13, 18, 25, 35, 34, 11, 1 21, 29, 40, 55, 75, 52, 13, 1 34, 47, 65, 90, 125, 143, 74, 15, 1 55, 76, 105, 145, 200, 275, 247, 100, 17, 1 ... Production array begins 1, 1 1, 2, 1 -2, -4, 2, 1 8, 16, -4, 2, 1 -40, -80, 16, -4, 2, 1 224, 448, -80, 16, -4, 2, 1 -1344, -2688, 448, -80, 16, -4, 2, 1 8448, 16896, -2688, 448, -80, 16, -4, 2, 1 ... which is based on A052701.
Comments