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Search: id:A067337
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| A067337 |
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Triangle where T(n,k)=2*T(n,k-1)+C(n-1,k)-C(n-1,k-1) and n>=k>=0. |
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3
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| 1, 1, 1, 1, 2, 3, 1, 3, 5, 9, 1, 4, 8, 14, 27, 1, 5, 12, 22, 41, 81, 1, 6, 17, 34, 63, 122, 243, 1, 7, 23, 51, 97, 185, 365, 729, 1, 8, 30, 74, 148, 282, 550, 1094, 2187, 1, 9, 38, 104, 222, 430, 832, 1644, 3281, 6561, 1, 10, 47, 142, 326, 652, 1262, 2476, 4925, 9842
(list; table; graph; listen)
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OFFSET
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0,5
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FORMULA
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T(n, k)=2*T(n, k-1)+A037012(n, k). T(n, k)=T(n-1, k-1)+T(n-1, k) if k<n. T(n, n)=Sum_{j<n}T(n, j)=3^(n-1) if n>0.
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EXAMPLE
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Rows start 1; 1,1; 1,2,3; 1,3,5,9; 1,4,8,14,27; etc. T(4,0)=2*0+1-0=1; T(4,1)=2*1+3-1=4; T(4,2)=2*4+3-3=8; T(4,3)=2*8+1-3=14; T(4,4)=2*14+0-1=27.
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CROSSREFS
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Row sums are A025192. Columns include A000012, A000027, and A022856 (essentially). Right hand columns include A000244 (essentially), A007051, and A047926. Central diagonal is A067336.
Sequence in context: A121775 A127951 A054250 this_sequence A047973 A020501 A086404
Adjacent sequences: A067334 A067335 A067336 this_sequence A067338 A067339 A067340
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KEYWORD
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nonn,tabl
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AUTHOR
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Henry Bottomley (se16(AT)btinternet.com), Jan 15 2002
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