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A178024
Number of permutations of 4 copies of 1..n with no element e[i>=2]<e[1+floor((i-2)/4)] (4-way heap)
0
1, 16, 1520, 495180, 433646850, 611015783700, 1736467679089500, 9462444875350395600
OFFSET
1,2
CROSSREFS
Simple 2-way heap A056971
Sequence in context: A302116 A294163 A180504 * A221613 A266156 A054947
KEYWORD
nonn
AUTHOR
R. H. Hardin May 17 2010
STATUS
approved