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A032095
Number of reversible strings with n-1 black beads and n-1 white beads. String is not palindromic.
+0
2
1, 1, 2, 10, 32, 126, 452, 1716, 6400, 24310, 92252, 352716, 1351616, 5200300, 20056584, 77558760, 300533760, 1166803110, 4537543340, 17672631900, 68923172032, 269128937220, 1052049129144, 4116715363800
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Maintained by
N. J. A. Sloane
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njas@research.att.com
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Last modified December 3 22:15 EST 2009. Contains 170310 sequences.
AT&T Labs Research
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