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A075533
Number of labeled rooted trees where each node at height h has 0 or h+1 children.
2
1, 2, 0, 12, 0, 0, 840, 0, 0, 50400, 831600, 0, 0, 302702400, 1135134000, 14529715200, 0, 2315673360000, 15545887156800, 140792940288000, 443497761907200, 28006062372288000, 623360743125120000
OFFSET
1,2
CROSSREFS
Sequence in context: A102869 A274177 A364375 * A355783 A053814 A293260
KEYWORD
nonn
AUTHOR
Christian G. Bower, Sep 19 2002
STATUS
approved