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Search: id:A085375
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| A085375 |
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a(n)=C(2n+1,n+1)C(n+4,4). |
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+0
1
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| 1, 15, 150, 1225, 8820, 58212, 360360, 2123550, 12033450, 66050270, 353068716, 1845586470, 9464546000, 47738754000, 237329805600, 1164893795820, 5653161067950, 27157342385250, 129275302348500, 610315506350550
(list; graph; listen)
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OFFSET
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0,2
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COMMENT
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a(n)=A000332/2*A000984 - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Jan 18 2007
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FORMULA
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a(n)=C(n+3,4)/2*C(2*n,n), n>=1 . - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Jan 18 2007
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MAPLE
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seq(binomial(n+3, 4)/2*binomial(2*n, n), n=1..20); - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Jan 18 2007
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MATHEMATICA
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Table[Binomial[2 n + 1, n + 1]Binomial[n + 4, 4], {n, 0, 30}]
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CROSSREFS
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Cf. A001700, A002457, A085373, A085374.
Cf. A000332, A000984.
Sequence in context: A023069 A121035 A022739 this_sequence A081135 A084902 A021364
Adjacent sequences: A085372 A085373 A085374 this_sequence A085376 A085377 A085378
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KEYWORD
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easy,nonn
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AUTHOR
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Mario Catalani (mario.catalani(AT)unito.it), Jun 26 2003
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