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”).

A159881 as a triangular array

1
2-1
3-31
4-65-1
5-1016-81
6-1542-4012-1
7-2199-16288-171
8-28219-585514-17323-1
9-36466-19742641-1379311-301
10-45968-638812538-95363245-52138-1

A159881 as a square array

12345678910
-1-3-6-10-15-21-28-36-45
15164299219466968
-1-8-40-162-585-1974-6388
11288514264112538
-1-17-173-1379-9536
1233113245
-1-30-521
138
-1
12345678910
-1-3-6-10-15-21-28-36-45
15164299219466968
-1-8-40-162-585-1974-6388
11288514264112538
-1-17-173-1379-9536
1233113245
-1-30-521
138
-1