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A134958 Number of hypertrees with n labeled vertices: analog of A030019 when edges of size 1 are allowed (with no two equal edges). 3
1, 2, 4, 32, 464, 9952, 284608, 10207360, 441006336, 22312355840, 1294525492224, 84749726259200, 6181332806029312, 497099907500220416, 43702202601439608832, 4169993748235341529088, 429217455330896263577600, 47406138617171801211797504 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..17.

FORMULA

Equals 2^n*A030019(n).

CROSSREFS

Sequence in context: A144937 A009110 A225170 * A101460 A118992 A012509

Adjacent sequences:  A134955 A134956 A134957 * A134959 A134960 A134961

KEYWORD

nonn

AUTHOR

Don Knuth, Jan 26 2008

STATUS

approved

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Last modified February 25 03:33 EST 2018. Contains 299630 sequences. (Running on oeis4.)