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A217326 Number of self-inverse permutations in S_n with longest increasing subsequence of length 6. 2
1, 6, 41, 209, 1106, 5323, 26069, 122901, 585922, 2747977, 13000269, 61088173, 289186846, 1366147708, 6496681304, 30905464864, 147912712795, 709073550307, 3418258506885, 16517431269189, 80230551304034, 390774361811783, 1912602871119956, 9388456361080840 (list; graph; refs; listen; history; text; internal format)
OFFSET
6,2
COMMENTS
Also the number of Young tableaux with n cells and 6 rows.
LINKS
FORMULA
a(n) = A182172(n,6)-A182172(n,5) = A007579(n)-A049401(n).
EXAMPLE
a(6) = 1: 123456.
a(7) = 6: 1234576, 1234657, 1235467, 1243567, 1324567, 2134567.
CROSSREFS
Column k=6 of A047884.
Sequence in context: A257602 A135232 A291890 * A196433 A197196 A295117
KEYWORD
nonn
AUTHOR
Alois P. Heinz, Sep 30 2012
STATUS
approved

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Last modified March 19 07:31 EDT 2024. Contains 370955 sequences. (Running on oeis4.)