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A036606 Triangle of coefficients of generating function of 4-ary rooted trees of height at most n. 1
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 3, 5, 6, 8, 9, 11, 11, 12, 11, 11, 9, 8, 6, 5, 3, 2, 1, 1, 1, 1, 1, 2, 4, 8, 14, 26, 44, 76, 125, 206, 327, 521, 802, 1231, 1845, 2742, 3987, 5748, 8124, 11364, 15615, 21212, 28336, 37412, 48597, 62368, 78810, 98359 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,13

LINKS

Table of n, a(n) for n=0..60.

E. M. Rains and N. J. A. Sloane, On Cayley's Enumeration of Alkanes (or 4-Valent Trees)., J. Integer Sequences, Vol. 2 (1999), Article 99.1.1.

Index entries for sequences related to rooted trees

EXAMPLE

1; 1,1; 1,1,1,1,1,1; 1,1,1,2,3,5,6,8,9,11,11,12,11,11,9,8,6,5,3,2,1,1;

CROSSREFS

Sequence in context: A026194 A289279 A102420 * A051837 A026371 A187335

Adjacent sequences:  A036603 A036604 A036605 * A036607 A036608 A036609

KEYWORD

nonn,tabf,easy

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified July 6 03:02 EDT 2020. Contains 335475 sequences. (Running on oeis4.)