Number of permutations of 4 copies of 1..n with all adjacent differences <= 2 in absolute value.

A177299

Number of permutations of 4 copies of 1..n with all adjacent differences <= 2 in absolute value.

Terms

    a(0) =1a(1) =1a(2) =70a(3) =34650a(4) =4635540a(5) =439192790a(6) =51023044582

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