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A035483 2n X 2n symmetric matrices whose first row is 1..2n and whose rows and columns are all permutations of 1..2n. 3
1, 1, 4, 456, 10936320 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Table of n, a(n) for n=0..4.

FORMULA

a(n) = A035481(2*n). [From Max Alekseyev, Apr 23 2010]

CROSSREFS

Cf. A000438, A035481, A000315, A002860, A003090, A040082.

Sequence in context: A104690 A300507 A215220 * A145570 A053292 A053963

Adjacent sequences:  A035480 A035481 A035482 * A035484 A035485 A035486

KEYWORD

more,nonn,nice

AUTHOR

Joshua Zucker and Joe Keane

STATUS

approved

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Last modified March 21 01:18 EDT 2019. Contains 321356 sequences. (Running on oeis4.)