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A060694
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A triangle related to rooted trees.
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0
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1, 2, 1, 10, 8, 2, 82, 86, 36, 6, 938, 1202, 668, 192, 24, 13778, 20772, 14118, 5452, 1200, 120, 247210, 427828, 341122, 161688, 48312, 8640, 720, 5240338, 10228458, 9325398, 5184902, 1909920, 467784, 70560, 5040, 128149802, 278346286
(list;
table;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,2
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COMMENTS
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The rows sum to A006963, the alternating sum is A000311, the right column is A000142, the left column is related to A032188 (twice); the second-to-right column is A052582
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LINKS
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Table of n, a(n) for n=1..38.
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FORMULA
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E.g.f. given by the Maple expression RootOf(-exp(_Z*x*t)+x*t*exp(_Z*x*t)+y*t*exp(-_Z+_Z*x*t)-y*t^2*x*exp(-_Z+_Z*x*t)+1-t+t*exp(-_Z+_Z*x*t)-x*t*exp(-_Z+_Z*x*t));
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EXAMPLE
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{1}, {2,1}, {10,8,2}, {82,86,36,6}, {938,1202,668,192,24}
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CROSSREFS
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Cf. A006963, A000311, A000142, A032188, A052582.
Sequence in context: A219900 A136233 A113088 * A217108 A127259 A152260
Adjacent sequences: A060691 A060692 A060693 * A060695 A060696 A060697
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KEYWORD
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nonn,tabl
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AUTHOR
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F. Chapoton, Apr 20 2001
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EXTENSIONS
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More terms from Vladeta Jovovic, Apr 21 2001
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STATUS
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approved
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