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A057553 Rank of (1,1,...,1) (n 1's) when {0,1,2,...}^n is lexicographically ordered. 0
1, 5, 16, 56, 203, 749, 2795, 10517, 39832, 151658, 579956, 2225964, 8570330, 33086030, 128028650, 496432760, 1928418395, 7503144365, 29235705215, 114064338335, 445552419545, 1742264571605, 6819546853625, 26717004445325 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..24.

FORMULA

a(n)=C(2n-1, n)+b(n-2)+1, where b=A057552.

EXAMPLE

For n=3, the ordering starts (0,0,0), (0,0,1), ... and the 15th term is (1,1,1).

CROSSREFS

Sequence in context: A120343 A301280 A153366 * A226973 A006217 A281870

Adjacent sequences:  A057550 A057551 A057552 * A057554 A057555 A057556

KEYWORD

nonn

AUTHOR

Clark Kimberling, Sep 07 2000

STATUS

approved

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Last modified May 17 15:44 EDT 2021. Contains 343980 sequences. (Running on oeis4.)