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A266735
Number of words on {1,1,2,2,3,3,...,n,n} avoiding the pattern 12345.
9
1, 1, 6, 90, 2520, 102011, 5176504, 307027744, 20472135280, 1496594831506, 117857270562568, 9869468603141427, 870255083860881152, 80185525536941657225, 7673807618627318341436, 759049283017632212000140, 77292554293281131959377376, 8075621155990277422800518076
OFFSET
0,3
CROSSREFS
Column k=4 of A267479.
Sequence in context: A177593 A132467 A177284 * A177564 A177565 A177576
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Jan 06 2016
EXTENSIONS
More terms from Alois P. Heinz, Jan 14 2016
STATUS
approved