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 A038287 #15 Sep 05 2025 10:23:01
%S A038287 1,8,9,64,144,81,512,1728,1944,729,4096,18432,31104,23328,6561,32768,
%T A038287 184320,414720,466560,262440,59049,262144,1769472,4976640,7464960,
%U A038287 6298560,2834352,531441,2097152,16515072,55738368,104509440,117573120,79361856,29760696,4782969
%N A038287 Triangle whose (i,j)-th entry is binomial(i,j)*8^(i-j)*9^j.
%D A038287 B. N. Cyvin et al., Isomer enumeration of unbranched catacondensed polygonal systems with pentagons and heptagons, Match, No. 34 (Oct 1996), pp. 109-121.
%e A038287 Triangle begins as:
%e A038287 1;
%e A038287 8, 9;
%e A038287 64, 144, 81;
%e A038287 512, 1728, 1944, 729;
%e A038287 4096, 18432, 31104, 23328, 6561;
%e A038287 ...
%t A038287 T[i_,j_]:=Binomial[i,j]*8^(i-j)*9^j; Table[T[i,j],{i,0,7},{j,0,i}]//Flatten (* _Stefano Spezia_, Sep 05 2025 *)
%Y A038287 Cf. A001018 (1st column), A001019 (diagonal), A001026 (row sums).
%K A038287 nonn,tabl,easy,changed
%O A038287 0,2
%A A038287 _N. J. A. Sloane_
%E A038287 a(32)-a(35) from _Stefano Spezia_, Sep 05 2025