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EXAMPLE
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The top left corner of the array A265609 with its terms shown in factorial base (A007623) looks like this:
1, 0, 0, 0, 0, 0, 0, 0, 0
1, 1, 10, 100, 1000, 10000, 100000, 1000000, 10000000
1, 10, 100, 1000, 10000, 100000, 1000000, 10000000, 100000000
1, 11, 200, 2200, 30000, 330000, 4000000, 44000000, 500000000
1, 20, 310, 10000, 110000, 1220000, 14000000, 160000000, 1830000000
1, 21, 1100, 13300, 220000, 3000000, 36000000, 452000000, 5500000000
1, 100, 1300, 24000, 411000, 6000000, 82000000, 1100000000, 13300000000
1, 101, 2110, 41000, 1000000, 13000000, 174000000, 2374000000, 30360000000
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Taking the most significant "digit" (placeholder that may get arbitrarily large values) gives us the top left corner of this array:
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1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1
1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7, 8, 8, 9, 9, 10, 10, 11
1, 2, 3, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3
1, 2, 1, 1, 2, 3, 3, 4, 5, 6, 7, 8, 10, 11, 12, 14, 15, 17, 19, 21, 1
1, 1, 1, 2, 4, 6, 8, 1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 4, 4, 5
1, 1, 2, 4, 1, 1, 1, 2, 3, 3, 4, 5, 6, 8, 9, 11, 12, 14, 16, 19, 21
1, 1, 3, 1, 1, 2, 3, 4, 6, 8, 11, 14, 1, 1, 1, 1, 2, 2, 2, 3, 3
1, 1, 3, 1, 2, 3, 5, 8, 1, 1, 1, 2, 2, 3, 4, 5, 6, 7, 8, 10, 12
1, 1, 4, 1, 3, 5, 9, 1, 2, 2, 3, 5, 6, 8, 11, 14, 17, 21, 1, 1, 1
1, 1, 1, 2, 4, 8, 1, 2, 3, 5, 7, 10, 14, 1, 1, 1, 2, 2, 3, 3, 4
1, 2, 1, 3, 6, 1, 2, 4, 6, 9, 14, 1, 1, 2, 3, 4, 5, 6, 8, 10, 13
1, 2, 1, 3, 1, 2, 3, 6, 10, 1, 1, 2, 3, 5, 6, 9, 12, 16, 21, 1, 1
1, 2, 1, 4, 1, 2, 5, 9, 1, 2, 3, 4, 7, 10, 14, 20, 1, 1, 2, 2, 3
1, 2, 2, 5, 1, 3, 7, 1, 2, 3, 5, 8, 13, 1, 1, 1, 2, 3, 4, 6, 8
...
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