A181959 Number of distinct 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.

9, 48, 236, 1274, 6489, 30229, 142320, 711955, 3601566

Offset

0,1

Links

Table of n, a(n) for n=0..8.

Derek M. Jones, R program to generate list

Index to sequences related to the complexity of n

Example

a(1)=48, the distinct values are -8 -7 -6 -5 -4 -3 -2 -1  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

Cf. A181898, A181957, A181958, A181960.

Sequence in context: A359175 A054460 A115053 * A171011 A264273 A226751

Adjacent sequences: A181956 A181957 A181958 * A181960 A181961 A181962

Keyword

nonn

Author

Derek M. Jones, Apr 03 2012

Status

approved