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A048828
Number of identity (asymmetric) trees of width n.
1
1, 0, 0, 0, 0, 1, 4, 66, 65328, 2146402440
OFFSET
0,7
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: A391825 A198893 A279886 * A225940 A003360 A367121
KEYWORD
nonn
AUTHOR
Christian G. Bower, Jun 15 1999
STATUS
approved