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Search: id:A147990
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| A147990 |
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Array A147985 (Polynomial coefficients) with zeros deleted. |
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+0
6
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| 1, 1, -1, 1, -3, 1, 1, -7, 13, -7, 1, 1, -15, 83, -220, 303, -220, 83, -15, 1, 1, -31, 413, -3141, 15261, -50187, 115410, -189036, 222621, -189036, 115410, -50187, 15261, -3141, 413, -31, 1, 1, -63, 1839, -33150, 414861, -3841195, 27378213, -154299168
(list; table; graph; listen)
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OFFSET
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1,5
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FORMULA
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Let s(1)=x and for n>=2, let s(n)=s(n,x)=S(n,y), where y=x^(1/2) and S(n,x)
is as at A147985. Then A147990 gives the coefficients of the polynomials s(n).
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EXAMPLE
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s(1)=x
s(2)=S(2,y)=x-1
s(3)=S(3,y)=x^2-3*x+1
s(4)=S(4,y)=x^4-7*x^3+13*x^2-7*x+1
so that as an array A147990 begins with
1
1 -1
1 -3 1
1 -7 13 -7 1
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CROSSREFS
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Cf. A147985, A147986, A147987, A147988, A147989, A147991, A147992, A147993.
Sequence in context: A137470 A112492 A049290 this_sequence A134567 A131932 A016462
Adjacent sequences: A147987 A147988 A147989 this_sequence A147991 A147992 A147993
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KEYWORD
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sign,tabl
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AUTHOR
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Clark Kimberling (ck6(AT)evansville.edu), Nov 25 2008
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