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Some tests please

Posted by domino at 2005-04-14 22:23:28 on Problem 2158 
I've been trying to solve this problem and i've checked my answers with a brute force program, but still i receive wrong answer. Could some one help me?
Are these answers corect?
f(4, 307) = 14029918686276756
f(4, 500) = 424587590915884800
f(3, 1000) = 133667000166700
f(2, 5000) = 41679167500
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