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Search: id:A110291
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| A110291 |
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Riordan array (1/(1-x),x(1+2x)). |
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+0
2
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| 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; listen)
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OFFSET
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0,5
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COMMENT
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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.
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EXAMPLE
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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;
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CROSSREFS
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Sequence in context: A027960 A131248 A116445 this_sequence A152027 A077308 A075001
Adjacent sequences: A110288 A110289 A110290 this_sequence A110292 A110293 A110294
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KEYWORD
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easy,nonn,tabl
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AUTHOR
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Paul Barry (pbarry(AT)wit.ie), Jul 18 2005
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