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 A278597 One half of A278481. 0
 1, 2, 2, 2, 3, 2, 2, 3, 3, 2, 2, 3, 3, 3, 2, 2, 3, 3, 3, 3, 2, 2, 3, 3, 3, 3, 3, 2, 2, 3, 3, 3, 3, 3, 3, 2, 2, 3, 3, 3, 3, 3, 3, 3, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Apart from the left border and the right border, the rest of the elements are 3's. LINKS FORMULA a(n) = A278481(n)/2. EXAMPLE The sequence written as a triangle begins:                       1;                     2,  2;                   2,  3,  2;                 2,  3,  3,  2;               2,  3,  3,  3,  2;             2,  3,  3,  3,  3,  2;           2,  3,  3,  3,  3,  3,  2;         2,  3,  3,  3,  3,  3,  3,  2;       2,  3,  3,  3,  3,  3,  3,  3,  2;     2,  3,  3,  3,  3,  3,  3,  3,  3,  2;   ... CROSSREFS Row sums give A016777. Left border gives A040000, the same as the right border. Middle column gives A122553. Every diagonal that is parallel to any of the borders gives the elements greater than 1 of A158799. Cf. A278481. Sequence in context: A160493 A053760 A223942 * A138789 A129654 A116504 Adjacent sequences:  A278594 A278595 A278596 * A278598 A278599 A278600 KEYWORD nonn,tabl AUTHOR Omar E. Pol, Nov 23 2016 STATUS approved

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Last modified December 14 01:19 EST 2019. Contains 329978 sequences. (Running on oeis4.)