| 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; listen)
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OFFSET
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0,14
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LINKS
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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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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 this_sequence A062442 A036964 A067162
Adjacent sequences: A036604 A036605 A036606 this_sequence 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 (njas(AT)research.att.com).
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