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0, 6, 120, 2016, 32640, 523776, 8386560, 134209536, 2147450880, 34359607296, 549755289600, 8796090925056, 140737479966720, 2251799780130816, 36028796884746240, 576460751766552576, 9223372034707292160, 147573952581086478336, 2361183241400462868480
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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LINKS
| Vincenzo Librandi, Table of n, a(n) for n = 0..200
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FORMULA
| a(n)=C(4^n,2),n>=0. - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Jan 07 2008
a(n)=20*a(n-1)-64*a(n-2). G.f.: 6*x/((16*x-1)*(4*x-1)). [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Mar 20 2009]
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MAPLE
| seq(binomial(4^n, 2), n=0..18); - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Jan 07 2008
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PROG
| (MAGMA) [4^n*(4^n-1)/2: n in [0..30]]; // Vincenzo Librandi, May 01 2011
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CROSSREFS
| Sequence in context: A115678 A048604 A001516 * A065888 A185757 A075844
Adjacent sequences: A026334 A026335 A026336 * A026338 A026339 A026340
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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