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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 3, 5, 7, 10, 12, 16, 19, 23, 25, 29, 30, 32, 32, 32, 30, 29, 25, 23, 19, 16, 12, 10, 7, 5, 3, 2, 1, 1, 1, 1, 1, 2, 4, 8, 15, 28, 50, 89, 155, 267, 451, 757, 1251, 2048, 3316, 5315, 8433, 13256, 20641, 31847, 48704, 73817
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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0,14
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LINKS
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Table of n, a(n) for n=0..65.
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
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EXAMPLE
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Triangle begins:
1;
1,1;
1,1,1,1,1,1,1;
1,1,1,2,...
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CROSSREFS
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Sequence in context: A087539 A140690 A004684 * A211520 A248578 A062442
Adjacent sequences: A036604 A036605 A036606 * A036608 A036609 A036610
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KEYWORD
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nonn,tabf,easy
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AUTHOR
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N. J. A. Sloane.
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STATUS
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approved
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