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Search: id:A113895
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| A113895 |
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A062190 formatted as a triangular array: triangle centered to right 2.column: 21 336 4950. |
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+0
1
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| 21, 336, 4950, 72072, 1051050, 15402816, 226972746, 3362559200, 50062040028, 748664904000, 11241203533560
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OFFSET
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0,1
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COMMENT
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C(2+2*n,n)*C(7+2*n,2+n)
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FORMULA
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C(2+2*n, n)*C(7+2*n, 2+n)
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EXAMPLE
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if n=0 then C(2+2*0,0)*C(7+2*0,2+0)=C(2,0)*C(7,2)=1*21=21
if n=7 then C(2+2*7,7)*C(7+2*7,2+7)=C(16,7)*C(21,9)=11440*293930=3362559200
if n=10 then C(2+2*10,10)*C(7+2*10,2+10)=C(22,10)*C(27,12)=646646*17383860=11241203533560
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CROSSREFS
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Cf. A062190.
Sequence in context: A051525 A107396 A036224 this_sequence A062260 A166914 A020311
Adjacent sequences: A113892 A113893 A113894 this_sequence A113896 A113897 A113898
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KEYWORD
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easy,nonn,uned
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AUTHOR
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Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Jan 28 2006
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