A224250 Number of permutations in S_n containing exactly 2 increasing subsequences of length 5.

0, 0, 0, 0, 0, 5, 128, 2124, 29445, 373379, 4517921, 53342405, 622358262, 7229196009, 83984283157, 978558652802, 11455522117193, 134879815196252, 1598299236441571, 19067702481168369

Offset

1,6

References

B. Nakamura and D. Zeilberger, Using Noonan-Zeilberger Functional Equations to enumerate (in Polynomial Time!) Generalized Wilf classes, Adv. in Appl. Math. 50 (2013), 356-366.

Links

Table of n, a(n) for n=1..20.

B. Nakamura and D. Zeilberger, Using Noonan-Zeilberger Functional Equations to enumerate (in Polynomial Time!) Generalized Wilf classes

Maple

# programs can be obtained from the Nakamura and Zeilberger link.

Crossrefs

Cf. A047889, A224248.

Sequence in context: A142803 A208859 A229147 * A316986 A355085 A316392

Adjacent sequences: A224247 A224248 A224249 * A224251 A224252 A224253

Keyword

nonn

Author

Brian Nakamura, Apr 02 2013

Status

approved