1331.
The pattern is the quartic function:
Un = (197n4 - 1854n3 + 6259n2 - 8730n + 4152)/24 for n = 1, 2, 3, ...
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The next number is the sequence 236175969, 48, 12 is 236175861.
32
I'm convinced that 3,840 is.
It is 2n * n!
6