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”).

A099781 as a simple table

na(n)
01
14
216
365
4268
51120
64737
720244
887280
9379073
101656348
117272896
1232060673
13141775396
14628505296
152791696705
1612419264300
1755315472416
18246607247233
191100229683508
204911436984752
2121934428189121
2297992663440444

[1,4,16,65,268,1120,4737,20244,87280,379073,
 1656348,7272896,32060673,141775396,628505296,
 2791696705,12419264300,55315472416,246607247233,
 1100229683508,4911436984752,21934428189121,
 97992663440444]