

A120348


Number of labeled simplyrooted 2trees with n labeled vertices (i.e., n+2 vertices altogether; a simplyrooted 2tree is an externally rooted 2tree whose root edge belongs to exactly one triangle).


1



1, 8, 156, 4896, 212520, 11793600, 797448960, 63606090240, 5846743244160, 608588457523200, 70758332701056000, 9088747467351552000, 1278179579224720972800, 195333707771834926694400
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