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EXAMPLE
| Triangle begins
1,
0, 1,
4, 0, 1,
0, 16, 0, 1,
80, 0, 40, 0, 1,
0, 640, 0, 80, 0, 1,
3904, 0, 2800, 0, 140, 0, 1,
0, 49152, 0, 8960, 0, 224, 0, 1,
354560, 0, 319744, 0, 23520, 0, 336, 0, 1,
0, 6225920, 0, 1454080, 0, 53760, 0, 480, 0, 1,
51733504, 0, 54897920, 0, 5230720, 0, 110880, 0, 660, 0, 1
Production matrix is
0, 1,
4, 0, 1,
0, 12, 0, 1,
16, 0, 24, 0, 1,
0, 80, 0, 40, 0, 1,
64, 0, 240, 0, 60, 0, 1,
0, 448, 0, 560, 0, 84, 0, 1,
256, 0, 1792, 0, 1120, 0, 112, 0, 1,
0, 2304, 0, 5376, 0, 2016, 0, 144, 0, 1
which is the exponential Riordan array [cosh(2x),x] minus its top row.
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