A036628 - OEIS

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A036628

Number of 4-ary rooted trees with n nodes and height exactly 4.

0, 0, 0, 0, 1, 3, 8, 18, 35, 65, 114, 194, 316, 510, 793, 1223, 1839, 2737, 3984, 5746, 8123, 11363, 15615, 21212, 28336, 37412, 48597, 62368, 78810, 98359, 120910, 146797, 175601, 207443, 241515, 277666, 314674, 352152, 388503

(list; graph; refs; listen; history; text; internal format)

OFFSET

0,6

LINKS

Sean A. Irvine, Table of n, a(n) for n = 0..84

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

CROSSREFS

Sequence in context: A081489 A055278 A293349 * A004035 A169763 A227161

Adjacent sequences: A036625 A036626 A036627 * A036629 A036630 A036631

KEYWORD

nonn,fini,full

AUTHOR

N. J. A. Sloane.

STATUS

approved