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This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A189250 Number of nX5 array permutations with each element making zero or one king moves.

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%I A189250 #7 Jul 22 2025 11:37:49
%S A189250 8,8448,1818336,637586496,194762146816,62111749014784,
%T A189250 19568579061640704,6188469597764755456,1954975627547701307392,
%U A189250 617793023145579401433088,195210690041588272450666496,61684603710077597393322917888
%N A189250 Number of nX5 array permutations with each element making zero or one king moves.
%C A189250 Column 5 of A189254
%H A189250 R. H. Hardin, <a href="/A189250/b189250.txt">Table of n, a(n) for n = 1..200</a>
%F A189250 Empirical: a(n) = 306*a(n-1) +14084*a(n-2) -3413208*a(n-3) -37913760*a(n-4) +8041363520*a(n-5) +7688826048*a(n-6) -6889761706624*a(n-7) +5202653015808*a(n-8) +2802990333573632*a(n-9) +6790227351584768*a(n-10) -685857854458576896*a(n-11) -5372869001388253184*a(n-12) +116164522590448566272*a(n-13) +1256789003575108927488*a(n-14) -12036143805249992589312*a(n-15) -142057852914628144398336*a(n-16) +683316680811034016481280*a(n-17) +8712086151000102590218240*a(n-18) -20982360025136584182464512*a(n-19) -305170070109551820472844288*a(n-20) +390572789229382186934730752*a(n-21) +6546500740363863628181405696*a(n-22) -5637881394993849134168932352*a(n-23) -93018389080728146789938495488*a(n-24) +78010006763315815363184164864*a(n-25) +938532475978901353401761660928*a(n-26) -935967387951105246060341100544*a(n-27) -6982213489888968493175154933760*a(n-28) +8208536967855964007383840063488*a(n-29) +39282469839804826862212505141248*a(n-30) -49486474219645506705232888856576*a(n-31) -176989359286385376521393885151232*a(n-32) +218162101995909369906474371776512*a(n-33) +660664519366159029203710007836672*a(n-34) -807327523225250130720326915457024*a(n-35) -1854716951333209150350914899410944*a(n-36) +2438769433212246552233842789318656*a(n-37) +3459765062072259416271709299277824*a(n-38) -5166969359086050195655423057461248*a(n-39) -3804557769955258800724459934187520*a(n-40) +6687224973041483611579174526910464*a(n-41) +1954196501306439388375809209139200*a(n-42) -4445500346232178934795207645855744*a(n-43) -410453643009045559599373546946560*a(n-44) +769221483476061219363229324541952*a(n-45) +360532064443933187500208881139712*a(n-46) +441276677000374259250463602900992*a(n-47) -22984496745428881982229057634304*a(n-48) -86322375040741113884861240705024*a(n-49) -6338178283858655043956944928768*a(n-50) +2155843450859023408765146759168*a(n-51) +80416536594945518072280121344*a(n-52) -7344224354158872236340019200*a(n-53)
%e A189250 Some solutions for 3X5
%e A189250 ..0..5..2..8..9....0..5..1..4..8....0..5..1..7..8....0..5..6..7..4
%e A189250 .10..1..3.13..4...10..7..2..3..9....6..2..3.14..4....1.12..2..3.13
%e A189250 ..6..7.11.12.14....6.12.11.13.14...10.11.12.13..9...11.10..8.14..9
%K A189250 nonn
%O A189250 1,1
%A A189250 _R. H. Hardin_ Apr 19 2011