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A112477 Riordan array ((1-x+sqrt(1+6x+x^2))/2, (sqrt(1+6x+x^2)-x-1)/2). 2
1, 1, 1, -2, -1, 1, 6, 2, -3, 1, -22, -6, 10, -5, 1, 90, 22, -38, 22, -7, 1, -394, -90, 158, -98, 38, -9, 1, 1806, 394, -698, 450, -194, 58, -11, 1, -8558, -1806, 3218, -2126, 978, -334, 82, -13, 1, 41586, 8558, -15310, 10286, -4942, 1838, -526, 110, -15, 1, -206098, -41586, 74614, -50746, 25150, -9922, 3142, -778, 142 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

0,4

LINKS

Table of n, a(n) for n=0..63.

EXAMPLE

Triangle starts

1;

1,1;

-2,-1,1;

6,2,-3,1;

-22,-6,10,-5,1;

90,22,-38,22,-7,1;

CROSSREFS

Inverse of triangle A112475. Row sums are A112478.

Sequence in context: A136707 A179972 A085826 * A156984 A181621 A307070

Adjacent sequences:  A112474 A112475 A112476 * A112478 A112479 A112480

KEYWORD

easy,sign,tabl

AUTHOR

Paul Barry, Sep 07 2005

STATUS

approved

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Last modified August 21 05:30 EDT 2019. Contains 326162 sequences. (Running on oeis4.)