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A106363 Planar trees where no branch is identical to its adjacent neighbor. 2
1, 1, 0, 1, 0, 1, 3, 7, 14, 43, 115, 326, 931, 2719, 7979, 23804, 71418, 216444, 660276, 2028558, 6268350, 19479746, 60835542, 190881085, 601459251, 1902680249, 6040955223, 19245061851, 61503863732, 197135868680, 633615135842 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,7
LINKS
FORMULA
G.f.: A(x) = B(x) + (C(x^2) - C(x)^2)/2. B(x) is g.f. of A106362. C(x) is g.f. of A106361.
CROSSREFS
Cf. A002995.
Sequence in context: A298913 A266019 A146155 * A128658 A234042 A001203
KEYWORD
nonn
AUTHOR
Christian G. Bower, Apr 29 2005
STATUS
approved

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Last modified March 28 18:04 EDT 2024. Contains 371254 sequences. (Running on oeis4.)