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Search: id:A127849
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| A127849 |
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a(n)=5^C(n,2)*(5^n-1)/4. |
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+0
2
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| 0, 1, 30, 3875, 2437500, 7626953125, 119201660156250, 9313106536865234375, 3637969493865966796875000, 7105423719622194766998291015625, 69388931933644926175475120544433593750
(list; graph; listen)
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OFFSET
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0,3
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COMMENT
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-a(n) is the Hankel transform of A127848, the series reversion of x/(1+6x+5x^2). Note that (5^n-1)/4 has g.f. x/(1-6x+5x^2).
(-1)^n*a(n) is the Hankel transform of the series reversion of x(1+4x)/(1+2x-3x^2). - Paul Barry (pbarry(AT)wit.ie), Jul 12 2008
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CROSSREFS
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Sequence in context: A036363 A001459 A115465 this_sequence A050984 A087216 A059049
Adjacent sequences: A127846 A127847 A127848 this_sequence A127850 A127851 A127852
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KEYWORD
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easy,nonn,new
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AUTHOR
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Paul Barry (pbarry(AT)wit.ie), Feb 02 2007
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