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Search: id:A147312
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| A147312 |
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Riordan array [1,log(sec(x)+tan(x))]. |
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+0
2
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| 1, 0, 1, 0, 0, 1, 0, 1, 0, 1, 0, 0, 4, 0, 1, 0, 5, 0, 10, 0, 1, 0, 0, 40, 0, 20, 0, 1, 0, 61, 0, 175, 0, 35, 0, 1, 0, 0, 768, 0, 560, 0, 56, 0, 1, 0, 1385, 0, 4996, 0, 1470, 0, 84, 0, 1
(list; table; graph; listen)
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OFFSET
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0,13
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COMMENT
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Row sums are A000111. Inverse is A147311.
Production array is [cosh(x),x] with a column of 0's prepended.
The product [sec(x),x]*A147312 is A147309.
Apart from signs, same as A147311. - 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,
0, 0, 1,
0, 1, 0, 1,
0, 0, 4, 0, 1,
0, 5, 0, 10, 0, 1,
0, 0, 40, 0, 20, 0, 1
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CROSSREFS
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Sequence in context: A111728 A143784 A147311 this_sequence A019974 A046781 A117435
Adjacent sequences: A147309 A147310 A147311 this_sequence A147313 A147314 A147315
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KEYWORD
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easy,nonn,tabl,more
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AUTHOR
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Paul Barry (pbarry(AT)wit.ie), Nov 05 2008
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