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”).

A045688 as a simple table

na(n)
00
10
20
31
429
51913
695
7311148869
810193207
91664108363
102097555460001
11374694625074883
12-48074332710505411
13-4945837680716249285383
14-2229960300928783674917
15-24840355960694307625698893
16-4153678459092607393588136503
17-61444568105054860319920405585007
18-335560999071136641584079760493377

[0,0,0,1,29,1913,95,311148869,10193207,1664108363,
 2097555460001,374694625074883,-48074332710505411,
 -4945837680716249285383,-2229960300928783674917,
 -24840355960694307625698893,
 -4153678459092607393588136503,
 -61444568105054860319920405585007,
 -335560999071136641584079760493377]