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Search: a212894 -id:a212894
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Number of (w,x,y,z) with all terms in {1,...,n} and w*x < 2*y*z.
+0
203
0, 1, 11, 58, 177, 437, 894, 1659, 2813, 4502, 6836, 10008, 14121, 19449, 26117, 34372, 44422, 56597, 71044, 88160, 108115, 131328, 158074, 188773, 223604, 263172, 307719, 357715, 413493, 475690, 544480, 620632, 704381, 796413
COMMENTS
A212894 ... min{|w-x|, |x-y|, |y-z|} = 1

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