The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A264462 Number of permutations of [n] with exactly three (possibly overlapping) occurrences of the generalized pattern 23-1. 2
 10, 98, 791, 6082, 46508, 360376, 2855580, 23244370, 194796665, 1682243510, 14973751272, 137345968648, 1297620307926, 12620234271634, 126265094967383, 1298634572382618, 13720327052477584, 148800093788609512, 1655374072150829472, 18877499531817214482 (list; graph; refs; listen; history; text; internal format)
 OFFSET 5,1 LINKS Alois P. Heinz, Table of n, a(n) for n = 5..500 EXAMPLE a(5) = 10: 23451, 24513, 24531, 34251, 35241, 45123, 45132, 45213, 45312, 45321. MAPLE b:= proc(u, o) option remember; `if`(u+o=0, 1, add(       b(u-j, o+j-1), j=1..u) +add(convert(series(       b(u+j-1, o-j)*x^u, x, 4), polynom), j=1..o))     end: a:= n-> coeff(b(n, 0), x, 3): seq(a(n), n=5..25); CROSSREFS Column k=3 of A260670. Sequence in context: A308523 A190985 A044642 * A198968 A125946 A158513 Adjacent sequences:  A264459 A264460 A264461 * A264463 A264464 A264465 KEYWORD nonn AUTHOR Alois P. Heinz, Nov 14 2015 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified April 15 01:24 EDT 2021. Contains 342974 sequences. (Running on oeis4.)