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Search: id:A100747
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| 1, 3, 15, 45, 225, 675, 3375, 10125, 50625, 151875, 759375, 2278125, 11390625, 34171875, 170859375, 512578125, 2562890625, 7688671875, 38443359375, 115330078125, 576650390625, 1729951171875, 8649755859375, 25949267578125
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OFFSET
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0,2
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COMMENT
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Interpolated zeros suppressed. The inverse mod 2 binomial transform of 2^n is 1,1,3,3,15,15,... (A100735).
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FORMULA
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a(0)=1, a(1)=0, a(n)=(5-2*mod(n/2, 2))a(n-2). a(n)=A101553(2(n+1))/5.
a(2n) = 15^n, a(2n+1) = 3 * 15^n. - Ralf Stephan, May 16 2007
O.g.f.: -(1+3*x)/(-1+15*x^2) . - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Feb 04 2008
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CROSSREFS
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Sequence in context: A030505 A074355 A005560 this_sequence A100737 A110464 A088108
Adjacent sequences: A100744 A100745 A100746 this_sequence A100748 A100749 A100750
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KEYWORD
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easy,nonn
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AUTHOR
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Paul Barry (pbarry(AT)wit.ie), Dec 06 2004
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