A048828 Number of identity (asymmetric) trees of width n.

1, 0, 0, 0, 0, 1, 4, 66, 65328, 2146402440

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