

A110291


Riordan array (1/(1x),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
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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 PadovanJacobsthal 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



