A268751 Number of sequences with n copies each of 1,2,...,n avoiding the pattern 12...n.

0, 0, 1, 374, 16140983, 173996758190594, 791857392420720220446647, 2285085934263252199073238394141449534, 5841526335200139692050292842849347521755651331941759, 17585875137049122003330684747231440185032966840579881629527695901745706

Offset

0,4

Links

Alois P. Heinz, Table of n, a(n) for n = 0..27

Formula

a(n) = A034841(n) - A268485(n).

Example

a(2) = 1: 2211.
a(3) = 374: 111333222, 113133222, 113313222, ..., 333221121, 333221211, 333222111.

Crossrefs

Main diagonal of A269129.

Cf. A034841, A268485.

Sequence in context: A364009 A093237 A269113 * A369663 A249550 A045200

Adjacent sequences: A268748 A268749 A268750 * A268752 A268753 A268754

Keyword

nonn

Author

Alois P. Heinz, Feb 12 2016

Status

approved