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A120346 Number of permutations avoiding 3142, 25314, 246135 and 362514. 0
1, 2, 6, 23, 102, 492, 2498, 13130, 70800, 389446, 2176802, 12328552, 70597568, 408061604, 2377643974, 13950607135, 82355028006, 488797440712, 2915087969496, 17459865132260, 104981190319396, 633438776314456 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

These permutations are the wreath closure of 1, 12, 21 and 2413.

LINKS

Table of n, a(n) for n=1..22.

R. Brignall, S. Huczynska and V. Vatter, Simple permutations and algebraic generating functions, arXiv:math.CO/0608391.

FORMULA

G.f. satisfies f^5+f^4+f^2+(x-1)f+x=0.

EXAMPLE

a(4)=23 because all permutations of length 4 except 3142 lies in this set.

CROSSREFS

Sequence in context: A263576 A231444 A248900 * A050389 A098746 A245389

Adjacent sequences:  A120343 A120344 A120345 * A120347 A120348 A120349

KEYWORD

nonn

AUTHOR

Vincent Vatter, Aug 16 2006

STATUS

approved

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Last modified October 17 11:44 EDT 2019. Contains 328108 sequences. (Running on oeis4.)