login

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

A203989 as a triangular array

1
-1-2
-313
116-1-4
-23-35-1015
39988515-1-6
-59-207-308-175-2117
8337479579832228-1-8
-111-611-1694-2475-1806-546-3619
143930318561496633369687045

A203989 as a square array

1-1-311-2339-5983-111143
-216-3598-207374-611930
3-1-1085-308795-16943185
-4115-175798-24756149
5-1-21322-18066633
-6128-5463696
7-1-36870
-8145
9
1-1-311-2339-5983-111143
-216-3598-207374-611930
3-1-1085-308795-16943185
-4115-175798-24756149
5-1-21322-18066633
-6128-5463696
7-1-36870
-8145
9