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A116392 Riordan array (1/sqrt(1-2x-3x^2), 1/sqrt(1-2x-3x^2)-1). 3
1, 1, 1, 3, 4, 1, 7, 13, 7, 1, 19, 42, 32, 10, 1, 51, 131, 128, 60, 13, 1, 141, 406, 475, 292, 97, 16, 1, 393, 1247, 1685, 1267, 561, 143, 19, 1, 1107, 3814, 5800, 5112, 2804, 962, 198, 22, 1, 3139, 11623, 19540, 19624, 12748, 5464, 1522, 262, 25, 1, 8953, 35334 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

0,4

LINKS

Table of n, a(n) for n=0..56.

FORMULA

Number triangle T(n,k)=sum{j=0..n, C(n,j)*A116389(j,k)}.

EXAMPLE

Triangle begins

1,

1, 1,

3, 4, 1,

7, 13, 7, 1,

19, 42, 32, 10, 1,

51, 131, 128, 60, 13, 1

CROSSREFS

Row sums are A115967. Diagonal sums are A116394.

Sequence in context: A075052 A111516 A210636 * A174607 A105578 A198739

Adjacent sequences:  A116389 A116390 A116391 * A116393 A116394 A116395

KEYWORD

easy,nonn,tabl

AUTHOR

Paul Barry, Feb 12 2006

STATUS

approved

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Last modified February 24 03:21 EST 2018. Contains 299595 sequences. (Running on oeis4.)