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A269113
Number of sequences with 3 copies each of 1,2,...,n avoiding the pattern 12...n.
2
0, 0, 1, 374, 173891, 117392909, 117108036719, 171248808285596, 360953073372968159, 1072323973643442736211, 4376906243609822466600689, 23919710914189027455648239834, 170865299381465355439286870245691, 1561721420156259852074018974532765369
OFFSET
0,4
LINKS
FORMULA
a(n) = A014606(n) - A047910(n).
CROSSREFS
Column k=3 of A269129.
Sequence in context: A210885 A364009 A093237 * A268751 A369663 A249550
KEYWORD
nonn
AUTHOR
Alois P. Heinz, Feb 19 2016
STATUS
approved