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 A163807 Reverse the order of inner digits (all digits but the first and last) of n written in binary. a(n) = the decimal value of the result. 0
 1, 2, 3, 4, 5, 6, 7, 8, 9, 12, 13, 10, 11, 14, 15, 16, 17, 24, 25, 20, 21, 28, 29, 18, 19, 26, 27, 22, 23, 30, 31, 32, 33, 48, 49, 40, 41, 56, 57, 36, 37, 52, 53, 44, 45, 60, 61, 34, 35, 50, 51, 42, 43, 58, 59, 38, 39, 54, 55, 46, 47, 62, 63, 64, 65, 96, 97, 80, 81, 112, 113, 72 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS This is a self-inverse permutation of the positive integers. LINKS EXAMPLE 18 in binary is 10010. The inner digits are 001. Reverse these, leaving the first digit (a 1) and the last digit (a 0) untouched, and we have 11000. a(18) is the decimal equivalent of 11000, which is 24. CROSSREFS Sequence in context: A143265 A109841 A174234 * A118766 A136399 A056167 Adjacent sequences:  A163804 A163805 A163806 * A163808 A163809 A163810 KEYWORD base,nonn AUTHOR Leroy Quet, Aug 04 2009 EXTENSIONS More terms from R. J. Mathar, Sep 27 2009 STATUS approved

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Last modified August 7 22:13 EDT 2022. Contains 355995 sequences. (Running on oeis4.)