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⇱ A036621 - OEIS

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A036621
Number of 6-ary rooted trees with n nodes and height at most 4.
1
1, 1, 1, 2, 4, 8, 15, 29, 52, 95, 168, 297, 513, 887, 1504, 2543, 4247, 7054, 11596, 18964, 30732, 49529, 79210, 125944, 198861, 312224, 487021, 755435, 1164641, 1785574, 2721591, 4125745, 6219019, 9324141, 13902921, 20620505, 30419742
OFFSET
0,4
LINKS
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.
CROSSREFS
Sequence in context: A332052 A088532 A271364 * A001383 A217733 A208976
KEYWORD
nonn,fini,full
STATUS
approved