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A069765 Number of distinct values obtained using n ones and the operations of sum, product and quotient. 1
1, 2, 4, 7, 13, 24, 42, 77, 138, 249, 454, 823, 1493, 2719, 4969, 9060, 16588, 30375, 55672 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..19.

Index entries for similar sequences

EXAMPLE

a(5)=13 because five ones yield the following 13 distinct values and no others: 1+1+1+1+1=5, 1+1+1+(1/1)=4, 1/(1+1+1+1)=1/4, 1+(1/1)+(1/1)=3, 1/(1+1+(1/1))=1/3, 1+(1/(1+1+1))=4/3, 1+(1/1)*(1/1)=2, 1/((1/1)+(1/1))=1/2, (1+1+1)/(1+1)=3/2, 1+1+(1/(1+1))=5/2, (1+1)/(1+1+1)=2/3, 1*1*1*1*1=1 and (1+1)*(1+1+1)=6.

CROSSREFS

Cf. A048249.

Sequence in context: A296689 A096236 A002574 * A090427 A006745 A049284

Adjacent sequences:  A069762 A069763 A069764 * A069766 A069767 A069768

KEYWORD

nonn

AUTHOR

John W. Layman, Apr 05 2002

STATUS

approved

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Last modified October 16 03:37 EDT 2019. Contains 328040 sequences. (Running on oeis4.)