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A213292 Number of n-length words w over 4-ary alphabet such that for every prefix z of w we have #(z,a_i) = 0 or #(z,a_i) >= #(z,a_j) for all j>i and #(z,a_i) counts the occurrences of the i-th letter in z. 2
1, 4, 16, 46, 118, 276, 712, 1805, 4895, 13280, 37993, 109386, 328219, 992413, 3101399, 9764376, 31580645, 102797899, 342075208, 1144125506, 3896297053, 13319243655, 46206520968, 160729837020, 565901313043, 1996113320841, 7111795754941, 25369213794266 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Alois P. Heinz, Table of n, a(n) for n = 0..130

CROSSREFS

Column k=4 of A213276.

Sequence in context: A000704 A007315 A055342 * A174836 A244252 A308592

Adjacent sequences:  A213289 A213290 A213291 * A213293 A213294 A213295

KEYWORD

nonn

AUTHOR

Alois P. Heinz, Jun 08 2012

STATUS

approved

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Last modified July 10 00:05 EDT 2020. Contains 335570 sequences. (Running on oeis4.)