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EXAMPLE
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a(1)=256 compositions of odd numbers into 9 parts <= 1:
1: (0,0,0,0,0,0,0,0,1) --> 9!/(8!1!) = 9
3: (0,0,0,0,0,0,1,1,1) --> 9!/(6!3!) = 84
5: (0,0,0,0,1,1,1,1,1) --> 9!/(4!5!) = 126
7: (0,0,1,1,1,1,1,1,1) --> 9!/(2!7!) = 36
9: (1,1,1,1,1,1,1,1,1) --> 9!/(0!9!) = 1
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256
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