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A181960 Number of distinct nonnegative integers that can be generated by an expression containing n binary operators (any of add, subtract, multiply and divide) whose operands are any integer between 1 and 9; parenthesis allowed. 5
9, 40, 156, 740, 3668, 16948, 77861, 379084, 1889419 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,1
LINKS
EXAMPLE
a(1)=40, the distinct values are: 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 20 21 24 25 27 28 30 32 35 36 40 42 45 48 49 54 56 63 64 72 81
CROSSREFS
Sequence in context: A006414 A344053 A213758 * A219511 A027137 A264106
KEYWORD
nonn,more
AUTHOR
Derek M. Jones, Apr 03 2012
STATUS
approved

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Last modified March 29 06:15 EDT 2024. Contains 371265 sequences. (Running on oeis4.)