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A048828
Number of identity (asymmetric) trees of width n.
1
1, 0, 0, 0, 0, 1, 4, 66, 65328, 2146402440
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OFFSET
0,7
LINKS
Table of n, a(n) for n=0..9.
Index entries for sequences related to trees
FORMULA
a(2n) = 2^(c(n-2))*(2^b(n-1) - b(n-1)-1), a(2n+1) = b(n)*(b(n)-1)/2, b:
A038081
. c:
A014221
.
CROSSREFS
Sequence in context:
A302657
A198893
A279886
*
A225940
A003360
A367121
Adjacent sequences:
A048825
A048826
A048827
*
A048829
A048830
A048831
KEYWORD
nonn
AUTHOR
Christian G. Bower
, Jun 15 1999
STATUS
approved
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Last modified July 13 09:39 EDT 2024. Contains 374274 sequences. (Running on oeis4.)