A161385 - OEIS

A161385

(1,2)-sequence where n-th run has length n^2.

1, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1

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OFFSET

1,2

LINKS

Reinhard Zumkeller, Table of n, a(n) for n = 1..10000

FORMULA

a(n) = A161382(n) + 1. - Reinhard Zumkeller, Aug 10 2014

MATHEMATICA

With[{x=10}, Riffle[Table[PadRight[{}, n^2, 1], {n, 1, x, 2}], Table[PadRight[{}, m^2, 2], {m, 2, x+1, 2}]]//Flatten] (* Harvey P. Dale, Jul 26 2024 *)

PROG

(Haskell)

a161385 = (+ 1) . a161382 -- Reinhard Zumkeller, Aug 10 2014

CROSSREFS

Cf. A161382.

Sequence in context: A101080 A130836 A279185 * A152907 A078786 A102677

Adjacent sequences: A161382 A161383 A161384 * A161386 A161387 A161388

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Nov 29 2009

STATUS

approved