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Search: id:A147309
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| A147309 |
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Riordan array [sec(x), log(sec(x)+tan(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 [cosh(x),x] beheaded. Inverse is A147308. Row sums are A000111(n+1).
Unsigned version of A147308. - 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: A143844 A065623 A147308 this_sequence A110064 A021253 A136586
Adjacent sequences: A147306 A147307 A147308 this_sequence A147310 A147311 A147312
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KEYWORD
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easy,nonn,tabl
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AUTHOR
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Paul Barry (pbarry(AT)wit.ie), Nov 05 2008
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