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Search: id:A147308
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| A147308 |
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Riordan array [sech(x), asin(tanh(x))]. |
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+0
3
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| 1, 0, 1, -1, 0, 1, 0, -4, 0, 1, 5, 0, -10, 0, 1, 0, 40, 0, -20, 0, 1, -61, 0, 175, 0, -35, 0, 1, 0, -768, 0, 560, 0, -56, 0, 1, 1385, 0, -4996, 0, 1470, 0, -84, 0, 1, 0, 24320, 0, -22720, 0, 3360, 0, -120, 0, 1
(list; table; graph; listen)
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OFFSET
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0,8
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COMMENT
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Production array is [cos(x),x] beheaded. Inverse is A147309. Row sums are A012123(n+1).
If signs are ignored this is identical to A147309. - N. J. A. Sloane (njas(AT)research.att.com), Nov 07 2008
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EXAMPLE
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Triangle begins
1,
0, 1,
-1, 0, 1,
0, -4, 0, 1,
5, 0, -10, 0, 1,
0, 40, 0, -20, 0, 1,
-61, 0, 175, 0, -35, 0, 1
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CROSSREFS
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Sequence in context: A100045 A143844 A065623 this_sequence A147309 A110064 A021253
Adjacent sequences: A147305 A147306 A147307 this_sequence A147309 A147310 A147311
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KEYWORD
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easy,sign,tabl,more
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AUTHOR
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Paul Barry (pbarry(AT)wit.ie), Nov 05 2008
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