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Search: id:A074079
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| A074079 |
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Square array A(row,col) (listed in order A(0,0), A(0,1), A(1,0), A(0,2), A(1,1), A(2,0), A(0,3), etc), giving essentially the same information as the triangle A074080 which shows only the upper triangular region. |
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5
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| 1, 1, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 1, 0, 2, 1, 0, 0, 0, 0, 0, 0, 3, 2, 0, 0, 0, 0, 0, 0, 1, 3, 5, 1, 0, 0, 0, 0, 0, 0, 1, 3, 10, 3, 0, 0, 0, 0, 0, 0, 0, 0, 3, 17, 9, 1, 0, 0, 0, 0, 0, 0, 0, 1, 5, 28, 24, 4, 0, 0, 0, 0, 0, 0, 0, 0, 0, 4, 41, 57, 14, 1, 0, 0, 0
(list; table; graph; listen)
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OFFSET
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0,31
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FORMULA
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A074079(n, k) = A073346(n, k)/(2^k)
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MAPLE
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A074079bi := (n, k) -> A073346bi(n, k)/(2^k);
A074079 := n -> A074079bi(A025581(n), A002262(n));
A025581 := n -> binomial(1+floor((1/2)+sqrt(2*(1+n))), 2) - (n+1);
A002262 := n -> n - binomial(floor((1/2)+sqrt(2*(1+n))), 2);
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CROSSREFS
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Obtained from the square array A073346 by dividing the entries on the k-th row by 2^k. Column sums: A073431. See A074080 for explanation. Cf. also A025581, A002262.
Sequence in context: A127844 A017877 A095683 this_sequence A037858 A037876 A161519
Adjacent sequences: A074076 A074077 A074078 this_sequence A074080 A074081 A074082
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KEYWORD
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nonn,tabl
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AUTHOR
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Antti Karttunen Aug 19 2002
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