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Search: id:A106246
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| A106246 |
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Number triangle T(n,k)=C(n,k)C(2,n-k). |
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+0
3
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| 1, 2, 1, 1, 4, 1, 0, 3, 6, 1, 0, 0, 6, 8, 1, 0, 0, 0, 10, 10, 1, 0, 0, 0, 0, 15, 12, 1, 0, 0, 0, 0, 0, 21, 14, 1, 0, 0, 0, 0, 0, 0, 28, 16, 1, 0, 0, 0, 0, 0, 0, 0, 36, 18, 1, 0, 0, 0, 0, 0, 0, 0, 0, 45, 20, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 55, 22, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 66, 24, 1, 0, 0, 0, 0, 0, 0
(list; table; graph; listen)
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OFFSET
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0,2
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COMMENT
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Row sums are C(n+2,2)=A000217(n+1). Diagonal sums are A106247. Subdiagonal is 2(n+1)=A005843(n+1). Second subdiagonal is A000217(n+1).
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FORMULA
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T(n,k)=A007318*A167194. [From Mats Granvik (mats.granvik(AT)abo.fi), Oct 30 2009]
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EXAMPLE
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Triangle begins
1;
2,1;
1,4,1;
0,3,6,1;
0,0,6,8,1;
0,0,0,10,10,1;
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CROSSREFS
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Cf. A007318, A167194. [From Mats Granvik (mats.granvik(AT)abo.fi), Oct 30 2009]
Sequence in context: A078076 A010247 A087605 this_sequence A136674 A144383 A064645
Adjacent sequences: A106243 A106244 A106245 this_sequence A106247 A106248 A106249
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KEYWORD
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easy,nonn,tabl
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AUTHOR
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Paul Barry (pbarry(AT)wit.ie), Apr 26 2005
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