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A030494
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If n is even, 2(n/2+1)!-1; if n is odd, ((n+1)/2+1)!-1.
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1, 3, 5, 11, 23, 47, 119, 239, 719, 1439, 5039, 10079, 40319, 80639, 362879, 725759, 3628799, 7257599, 39916799, 79833599, 479001599, 958003199, 6227020799, 12454041599, 87178291199, 174356582399, 1307674367999, 2615348735999
(list; graph; refs; listen; history; internal format)
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