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Is there a pattern Here?
4, 6, 32, 60, 384, 840, 6144, 15120 ...
All I can come up with is:
.....................4
.....................6
................4*..8
................6*10
...........4*..8*12
...........6*10*14
......4*..8*12*16
......6*10*14*18
...
But how do I put that into a formula? And it also seems a bit strange, is there something simpler I am missing?
1 Answer
- ted sLv 79 years agoFavorite Answer
a_(2n +1 ) = 4^n [ n! ] and
a_(2n) = 2^n [ 3 x 5 x 7....x (2n + 1 ) ] = 2^n [ (2n+1)! / { 2^n } ( n! ) ] ≡ [ 2n+1] ! / [ n! ]
