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Search: id:A119687
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| 1, 1, 1, 1, 2, 1, 1, 5, 5, 1, 1, 26, 26, 1, 1, 677, 3176, 3176, 677, 1
(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)=T(n-1, k-1)^2 + T(n-1, k)^2 ; T(0,0)=1 ; T(n,-1):=0 ; T(n, k):=0, n<k.
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EXAMPLE
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Triangle begins:
1;
1, 1;
1, 2, 1;
1, 5, 5, 1;
1, 26, 50, 26, 1;
1, 677, 3176, 3176, 677, 1;
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CROSSREFS
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Cf. A007318.
Sequence in context: A060854 A091378 A156045 this_sequence A086856 A052916 A156576
Adjacent sequences: A119684 A119685 A119686 this_sequence A119688 A119689 A119690
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KEYWORD
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nonn,tabl
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AUTHOR
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Philippe DELEHAM (kolotoko(AT)wanadoo.fr), Jun 09 2006
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