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A288351 Number of strings of n digits from 1...9 such that no formula using the single digits in the given order exists that evaluates to 0. 7
9, 72, 455, 1500, 1014, 181, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

For definitions and comments see A288350.

It is conjectured that a(n)=0 for n>=8.

The conjecture is true, as shown in the corresponding comment in A288350. - Hugo Pfoertner, Jun 09 2017

LINKS

Table of n, a(n) for n=1..78.

EXAMPLE

a(1)=9 because 1...9 /=0. a(2)=72, because only the 9 numbers 11, 22, ..., 99 of the 81 two-digit strings can represent 0.

CROSSREFS

Cf. A288350, A288352, A288353, A288354, A288355, A288356.

Sequence in context: A070823 A073988 A005778 * A319892 A319873 A110396

Adjacent sequences:  A288348 A288349 A288350 * A288352 A288353 A288354

KEYWORD

nonn

AUTHOR

Hugo Pfoertner, Jun 08 2017

STATUS

approved

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Last modified May 22 10:52 EDT 2022. Contains 353949 sequences. (Running on oeis4.)