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”).

A221275 as a triangular array

0
00
040
1400
0250160
0521001600
0196010890640
15200492067246400
0168109486405664402560
0484046656707600062642440068925600
01488409517225062220544031222890

A221275 as a square array

00010001000
04425521965201681484014884
000100000466560
0161610894920948647076009517225
0006724000
064645664462642462220544
0004006890
02562563122289
000
0
00010001000
04425521965201681484014884
000100000466560
0161610894920948647076009517225
0006724000
064645664462642462220544
0004006890
02562563122289
000
0