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A229712
Number of arrays of length n that are sums of 2 consecutive elements of length n+1 permutations of 0..n, and no two consecutive rises or falls in the latter permutation.
0
1, 4, 6, 32, 86, 544, 2194, 15872, 86642, 707584, 4887130, 44736512, 373320362, 3807514624, 37157321890
OFFSET
1,2
COMMENTS
Column 2 of A229717.
EXAMPLE
Some solutions for n=4:
3 7 2 2 4 4 6 3 5 3 5 5 4 7 4 6
2 4 4 3 3 2 4 5 6 2 3 6 5 5 5 5
3 2 5 5 4 3 3 4 5 4 4 4 6 3 4 4
5 3 4 7 3 4 4 3 3 7 5 1 4 2 5 3
CROSSREFS
Sequence in context: A078250 A239224 A087299 * A377646 A331513 A164127
KEYWORD
nonn,more
AUTHOR
R. H. Hardin, Sep 27 2013
STATUS
approved