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A008308
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Triangle of tangent numbers.
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1
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1, 1, 2, 1, 8, 1, 16, 20, 1, 136, 40, 1, 272, 616, 70, 1, 3968, 2016, 112, 1, 7936, 28160, 5376, 168, 1, 176896, 135680, 12432, 240, 1, 353792, 1805056, 508640, 25872, 330, 1, 11184128, 11977856, 1595264, 49632, 440, 1, 22368256, 154918400, 59835776
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,3
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REFERENCES
| L. Comtet, Advanced Combinatorics, Reidel, 1974, p. 259.
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EXAMPLE
| 1; 1; 2,1; 8,1; 16,20,1; 136,40,1; ...
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CROSSREFS
| Essentially the same triangle as A059419, which is the main entry for this triangle.
Sequence in context: A102208 A125911 A009385 * A176889 A118931 A101280
Adjacent sequences: A008305 A008306 A008307 * A008309 A008310 A008311
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KEYWORD
| tabf,nonn,nice
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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EXTENSIONS
| More terms from Larry Reeves (larryr(AT)acm.org), Feb 08 2001
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