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back to boardMy formula Answer for n is n*(n+1)/2*(n+2) For example if n=2 then answer is 2*3/2*4=12 Re: My formula The formula is correct and is easily proven by solving the sums: sum(i=0 -> N) sum(j=0 -> N) (i + j) Edited by author 03.02.2012 17:25 Re: My formula Posted by Bogatyr 16 Oct 2012 15:22 Actually the inner sum needs to start at i, not at zero. Starting at 0 counts non-double dominoes twice. |
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