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Search: id:A082489
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| A082489 |
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Sum[ binomial[n, k] binomial[n + k, k] binomial[n + 2k, k] binomial[n + 3k, k] binomial[n + 4k, k], {k, 0, n} ] |
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1
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| 1, 121, 114121, 169417921, 308238414121, 629799991355641, 1387152264043496161, 3220175519103433952161, 7771784978946238318454761, 19326687177288750280293146161, 49215884415076728067274047737961
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