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Search: id:A140218
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| A140218 |
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Denominators of the inverse triangle to that described in A133135. |
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+0
2
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| 1, 1, 1, 1, 2, 1, 1, 2, 1, 1, 1, 4, 1, 2, 1, 1, 4, 1, 2, 1, 1, 1, 4, 1, 1, 1, 2, 1, 1, 4, 1, 1, 1, 2, 1, 1, 1, 8, 1, 2, 1, 4, 1, 2, 1, 1, 8, 1, 2, 1, 4, 1, 2, 1, 1, 1, 8, 1, 1, 1, 4, 1, 2, 1, 2, 1, 1, 8, 1, 1, 1, 4, 1, 2, 1, 2, 1, 1, 1, 8, 1, 2, 1, 2, 1, 2, 1, 4, 1, 2, 1, 1, 8, 1, 2, 1, 2, 1, 2, 1, 4, 1, 2, 1, 1
(list; table; graph; listen)
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OFFSET
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0,5
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COMMENT
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The inverse of the triangle of fractions starts
1;
-1, 1;
1, -3/2, 1;
-1, 3/2,-2, 1;
1, -5/4, 2, -5/2, 1;
-1, 5/4 -1, 5/2, -3, 1;
1, -7/4, 1, 0, 3, -7/2, 1;
-1, 7/4,-4, 0, 2, 7/2,-4, 1;
1, 3/8, 4,-21/2, -2, 21/4, 4,-9/2, 1;
-1, -3/8,13, 21/2,-26,-21/4,10, 9/2,-5, 1;
to yield the triangle of denominators
1;
1,1;
1,2,1;
1,2,1,1;
1,4,1,2,1;
1,4,1,2,1,1;
1,4,1,1,1,2,1;
1,4,1,1,1,2,1,1;
1,8,1,2,1,4,1,2,1;
1,8,1,2,1,4,1,2,1,1;
1,8,1,1,1,4,1,2,1,2,1;
1,8,1,1,1,4,1,2,1,2,1,1;
Number pairs show up if reading this along diagonals or columns.
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CROSSREFS
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Cf. A133135, A140216, A000079.
Sequence in context: A117975 A143258 A027199 this_sequence A159704 A101428 A023586
Adjacent sequences: A140215 A140216 A140217 this_sequence A140219 A140220 A140221
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KEYWORD
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nonn,frac,tabl
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AUTHOR
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Paul Curtz (bpcrtz(AT)free.fr), Jun 22 2008
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EXTENSIONS
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Extended by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Aug 02 2008
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