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.
%I A252982 #6 Jul 23 2025 13:49:59 %S A252982 15,145,1836,27905,433401,5672484,60650883,766674140,4970634131, %T A252982 18692194423,49050683133,101029007619,176694157069,276519316503, %U A252982 400550856993,548788778539,721233081141,917883764799,1138740829513 %N A252982 Number of nX7 nonnegative integer arrays with upper left 0 and lower right its king-move distance away minus 2 and every value increasing by 0 or 1 with every step right, diagonally se or down. %C A252982 Column 7 of A252983 %H A252982 R. H. Hardin, <a href="/A252982/b252982.txt">Table of n, a(n) for n = 1..210</a> %F A252982 Empirical: a(n) = 12103190528*n^2 - 226960984822*n + 1081747760523 for n>12 %e A252982 Some solutions for n=4 %e A252982 ..0..0..1..1..1..1..1....0..1..1..2..2..3..3....0..1..1..2..2..2..2 %e A252982 ..0..0..1..2..2..2..2....1..1..2..2..3..3..3....0..1..1..2..2..2..2 %e A252982 ..1..1..1..2..3..3..3....1..1..2..3..3..3..4....0..1..1..2..3..3..3 %e A252982 ..1..2..2..2..3..4..4....1..1..2..3..3..3..4....0..1..1..2..3..3..4 %K A252982 nonn %O A252982 1,1 %A A252982 _R. H. Hardin_, Dec 25 2014