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Search: id:A032086
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| A032086 |
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Number of reversible strings with n beads of 3 colors. If more than 1 bead, not palindromic. |
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+0
2
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| 3, 3, 9, 36, 108, 351, 1053, 3240, 9720, 29403, 88209, 265356, 796068, 2390391, 7171173, 21520080, 64560240, 193700403, 581101209, 1743362676, 5230088028, 15690441231, 47071323693, 141214502520, 423643507560
(list; graph; listen)
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