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Search: id:A140994
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| A140994 |
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Triangle read by rows: recurence G(n,k): G(n, n)=G(n+1, 0)=1, G(n+2, 1)=2, G(n+3, 2)=4, G(n+4, k)=G(n+1, k-2)+G(n+1, k-3)+G(n+2, k-2)+G(n+3, k-1) for k:=3..(n+3), 0<=k<=n. |
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+0
2
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| 1, 1, 1, 1, 2, 1, 1, 2, 4, 1, 1, 2, 4, 8, 1, 1, 2, 4, 9, 15, 1, 1, 2, 4, 9, 19, 28, 1, 1, 2, 4, 9, 19, 40, 52, 1, 1, 2, 4, 9, 19, 41, 83, 96, 1, 1, 2, 4, 9, 19, 41, 88, 170, 177, 1, 1, 4, 9, 19, 41, 88, 188, 345, 326, 1, 1, 2, 4, 9, 19, 41, 88, 189, 400, 694, 600, 1, 1
(list; table; graph; listen)
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OFFSET
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0,5
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EXAMPLE
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Triangle begins:
1
1 1
1 2 1
1 2 4 1
1 2 4 8 1
1 2 4 9 15 1
1 2 4 9 19 28 1
1 2 4 9 19 40 52 1
1 2 4 9 19 41 83 96 1
1 2 4 9 19 41 88 170 177 1
1 2 4 9 19 41 88 188 345 326 1
1 2 4 9 19 41 88 189 400 694 400 1
1 2 4 9 19 41 88 189 406 1846 1386 1104 1
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CROSSREFS
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Cf. A007318.
Sequence in context: A023506 A140995 A141021 this_sequence A140993 A027935 A137940
Adjacent sequences: A140991 A140992 A140993 this_sequence A140995 A140996 A140997
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KEYWORD
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nonn,tabl
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AUTHOR
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Juri-Stepan Gerasimov (2stepan(AT)rambler.ru), Jul 08 2008
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