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A098730
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Sum[i=0..n, Sum[j=0..n, C(n-i,i+j) * C(n-j,i+j) ]].
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0
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1, 1, 5, 14, 46, 145, 462, 1465, 4641, 14671, 46298, 145858, 458811, 1441204, 4521255, 14167145, 44344445, 138665650, 433218100, 1352333899, 4218220602, 13148256139, 40956562683, 127501720725, 396702130246, 1233632920766
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OFFSET
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0,3
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LINKS
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MATHEMATICA
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Table[Sum[Sum[Binomial[n-i, i+j]Binomial[n-j, i+j], {j, 0, n}], {i, 0, n}], {n, 0, 30}] (* Harvey P. Dale, Jan 25 2023 *)
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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