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Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!) A368720 a(n) = Product_{j=1..n, k=1..n} (j^3 + k^3 + n^3). 3 1, 3, 69360, 1522177267723200, 391047538356893112890665992192000, 6785985430272886334677590546861463643140253138288640000000 (list; graph; refs; listen; history; text; internal format) OFFSET 0,2 LINKS Table of n, a(n) for n=0..5. FORMULA Limit_{n->oo} a(n)^(1/(n^2)) / n^3 = exp(Integral_{x=0..1, y=0..1} log(x^3 + y^3 + 1) dy dx) = 1.4501318426779115107161463152054835452511102493859148975306452... MATHEMATICA Table[Product[j^3 + k^3 + n^3, {j, 1, n}, {k, 1, n}], {n, 0, 6}] CROSSREFS Cf. A368685, A368622, A368721. Cf. A324426, A368722. Sequence in context: A340182 A367550 A178966 * A175551 A230719 A213000 Adjacent sequences: A368717 A368718 A368719 * A368721 A368722 A368723 KEYWORD nonn AUTHOR Vaclav Kotesovec, Jan 04 2024 STATUS approved

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Last modified August 18 13:06 EDT 2024. Contains 375269 sequences. (Running on oeis4.)