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Search: id:A092690
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| A092690 |
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Row sums of triangle A092689, which is related to the central trinomial coefficients (A002426). |
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+0
2
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| 1, 2, 7, 22, 71, 226, 717, 2262, 7107, 22246, 69413, 215986, 670441, 2076686, 6420403, 19816362, 61070499, 187953174, 577742469, 1773918642, 5441141589, 16674016758, 51052484343, 156188410098, 477487110429, 1458741494826
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OFFSET
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0,2
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PROGRAM
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(PARI) {T(n, k)=if(n<0|k>n, 0, if(n==0&k==0, 1, if(n==1&k<=1, 1, if(k==n-1, T(n-1, 0), if(k==n, T(n, 0), 2*T(n-1, k)+T(n-1, k+1))))))} a(n)=sum(k=0, n, T(n, k))
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CROSSREFS
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Cf. A002426, A092683, A092686, A092689.
Sequence in context: A077833 A106438 A109999 this_sequence A030186 A116387 A114495
Adjacent sequences: A092687 A092688 A092689 this_sequence A092691 A092692 A092693
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KEYWORD
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nonn
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AUTHOR
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Paul D. Hanna (pauldhanna(AT)juno.com), Mar 04 2004
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