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A110291 Riordan array (1/(1-x),x(1+2x)). 1
1, 1, 1, 1, 3, 1, 1, 3, 5, 1, 1, 3, 9, 7, 1, 1, 3, 9, 19, 9, 1, 1, 3, 9, 27, 33, 11, 1, 1, 3, 17, 1, 1, 3, 9, 27, 81, 243, 473, 379, 129, 19, 1, 1, 3, 9, 27, 81, 243, 665, 939, 577, 163, 21, 1, 1, 3, 9, 27, 81, 243, 729, 1611, 1697, 835, 201, 23, 1 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

0,5

COMMENTS

Row sums are A000975(n+1) (partial sums of Jacobsthal numbers A001045). Diagonal sums are A052947(n+1) (partial sums of Padovan-Jacobsthal numbers A052947). Inverse is A110292.

LINKS

Table of n, a(n) for n=0..67.

EXAMPLE

Rows begin

1;

1,1;

1,3,1;

1,3,5,1;

1,3,9,7,1;

1,3,9,19,9,1;

1,3,9,27,33,11,1;

1,3,9,27,65,51,13,1;

1,3,9,27,81,131,73,15,1;

CROSSREFS

Sequence in context: A271451 A131248 A116445 * A152027 A077308 A075001

Adjacent sequences:  A110288 A110289 A110290 * A110292 A110293 A110294

KEYWORD

easy,nonn,tabl

AUTHOR

Paul Barry, Jul 18 2005

STATUS

approved

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Last modified February 23 23:56 EST 2018. Contains 299595 sequences. (Running on oeis4.)