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Search: id:A135326
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| A135326 |
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Sum of all n-digit Riordan numbers. |
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+0
1
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| 12, 142, 835, 5798, 124932, 853467, 6536382, 50852019, 1234849644, 9043402501
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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These numbers are also called the Motzkin sum numbers.
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LINKS
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Eric Weisstein's World of Mathematics, Isotropic Tensor.
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EXAMPLE
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Sum of all 1-digit Riordan numbers is 12.
Sum of all 2-digit Riordan numbers is 142.
Sum of all 3-digit Riordan numbers is 835.
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PROGRAM
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MS Excel 2007
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CROSSREFS
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Cf. A005043.
Adjacent sequences: A135323 A135324 A135325 this_sequence A135327 A135328 A135329
Sequence in context: A003379 A124206 A061636 this_sequence A056340 A056330 A004191
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KEYWORD
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nonn
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AUTHOR
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Parthasarathy Nambi (PachaNambi(AT)yahoo.com), Dec 06 2007
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