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”).

A221278 as a simple table

na(n)
10
216
316
41089
54920
694864
7707600
89517225
987086136
101018120464
1110150470672
12112064927121
131158005545528
1412485339571600
15130957423363216

[0,16,16,1089,4920,94864,707600,9517225,87086136,
 1018120464,10150470672,112064927121,1158005545528,
 12485339571600,130957423363216]