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A046997
Number of Baxter permutations: A001183/2.
0
0, 1, 1, 9, 33, 187, 847, 4911, 25849
OFFSET
1,4
CROSSREFS
Sequence in context: A147444 A189179 A146445 * A013488 A186762 A343843
KEYWORD
nonn,more
STATUS
approved