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A007562 Number of planted trees where non-root, non-leaf nodes an even distance from root are of degree 2.
(Formerly M0773)
+0
3
1, 1, 1, 2, 3, 6, 10, 20, 36, 72, 137, 275, 541, 1098, 2208, 4521, 9240, 19084, 39451, 82113, 171240, 358794, 753460, 1587740, 3353192, 7100909, 15067924, 32044456, 68272854, 145730675, 311575140, 667221030, 1430892924, 3072925944 (list; graph; listen)
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Last modified December 13 23:45 EST 2009. Contains 170824 sequences.


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