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Search: id:A057553
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| A057553 |
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Rank of (1,1,...,1) (n 1's) when {0,1,2,...}^n is lexicographically ordered. |
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+0
1
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| 1, 5, 16, 56, 203, 749, 2795, 10517, 39832, 151658, 579956, 2225964, 8570330, 33086030, 128028650, 496432760, 1928418395, 7503144365, 29235705215, 114064338335, 445552419545, 1742264571605, 6819546853625, 26717004445325
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OFFSET
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1,2
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FORMULA
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a(n)=C(2n-1, n)+b(n-2)+1, where b=A057552.
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EXAMPLE
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For n=3, the ordering starts (0,0,0), (0,0,1), ... and the 15th term is (1,1,1).
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CROSSREFS
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Adjacent sequences: A057550 A057551 A057552 this_sequence A057554 A057555 A057556
Sequence in context: A089102 A098912 A120343 this_sequence A006217 A116914 A047103
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KEYWORD
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nonn
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AUTHOR
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Clark Kimberling (ck6(AT)evansville.edu), Sep 07 2000
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