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Search: id:A137644
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| A137644 |
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a(n) = Sum_{k=0..n} C(n+k,k)*C(n+k,n-k). |
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+0 1
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| 1, 3, 16, 95, 591, 3780, 24620, 162423, 1081780, 7258053, 48982176, 332140328, 2261099491, 15444137880, 105789736896, 726426836103, 4998885106599, 34464824536500, 238017084356680, 1646234203000485, 11401464090042224
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