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A129960
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a(n) = floor(sqrt(2*n!)).
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2
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1, 1, 2, 3, 6, 15, 37, 100, 283, 851, 2693, 8934, 30951, 111597, 417560, 1617203, 6468815, 26671611, 113158063, 493244564, 2205856753, 10108505544, 47413093714, 227385209452, 1113955476429, 5569777382145, 28400403557928, 147572825753377, 780881994429009
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OFFSET
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0,3
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COMMENTS
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a(n) is the index of the closest triangular number to n!. - Ruediger Jehn, Nov 11 2020
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LINKS
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PROG
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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