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Search: id:A117436
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| A117436 |
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Triangle related to exp(x)sec(2x). |
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3
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| 1, 0, 1, 4, 0, 1, 0, 12, 0, 1, 80, 0, 24, 0, 1, 0, 400, 0, 40, 0, 1, 3904, 0, 1200, 0, 60, 0, 1, 0, 27328, 0, 2800, 0, 84, 0, 1, 354560, 0, 109312, 0, 5600, 0, 112, 0, 1, 0, 3191040, 0, 327936, 0, 10080, 0, 144, 0, 1, 51733504, 0, 15955200, 0, 819840, 0, 16800, 0, 180, 0
(list; table; graph; listen)
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OFFSET
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0,4
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COMMENT
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Row sums are A117437. Inverse is A117435. First column is A002436.
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FORMULA
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Number triangle whose k-th column has e.g.f. (x^k/k!)*sec(2x)
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EXAMPLE
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1,
0, 1,
4, 0, 1,
0, 12, 0, 1,
80, 0, 24, 0, 1,
0, 400, 0, 40, 0, 1,
3904, 0, 1200, 0, 60, 0, 1,
0, 27328, 0, 2800, 0, 84, 0, 1,
354560, 0, 109312, 0, 5600, 0, 112, 0, 1,
0, 3191040, 0, 327936, 0, 10080, 0, 144, 0, 1,
51733504, 0, 15955200, 0, 819840, 0, 16800, 0, 180, 0, 1
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CROSSREFS
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Sequence in context: A019974 A046781 A117435 this_sequence A166318 A166317 A068346
Adjacent sequences: A117433 A117434 A117435 this_sequence A117437 A117438 A117439
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KEYWORD
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nonn,tabl
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AUTHOR
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Paul Barry (pbarry(AT)wit.ie), Mar 16 2006
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