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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 August 14 10:04 EDT 2024. Contains 375159 sequences. (Running on oeis4.)