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A160569 a(n)=9*(a(n-1)a(n-3)-a(n-2)^2)/a(n-4), a(1)=a(2)=a(3)=1, a(4)=-9. 1
1, 1, 1, -9, -90, -1539, 51759, 7026831, 1349328699, -119669884380, -462804380329131, -818173230956710191, -775566981773559330471, 23349606875054800260574779, 383206716517298992863985977570 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,4

COMMENTS

a(n+1) is the Hankel transform of A160568.

LINKS

Table of n, a(n) for n=0..14.

CROSSREFS

Cf. A050512, A160566.

Sequence in context: A294610 A294813 A218118 * A157545 A274953 A157558

Adjacent sequences:  A160566 A160567 A160568 * A160570 A160571 A160572

KEYWORD

easy,sign

AUTHOR

Paul Barry, May 19 2009

STATUS

approved

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Last modified February 22 23:03 EST 2019. Contains 320411 sequences. (Running on oeis4.)