A012234 - OEIS

The OEIS is supported by the many generous donors to the OEIS Foundation.

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”).

Other ways to Give

A012234 as a simple table

n	a(n)
0	1
1	1
2	9
3	281
4	13233
5	1179729
6	144386553
7	25501409961
8	5869292202465
9	1744083324947745
10	643531258862953065
11	289976769842011018425
12	156375721502624955046545
13	99525811638120512862203505

[1,1,9,281,13233,1179729,144386553,25501409961, 5869292202465,1744083324947745,643531258862953065, 289976769842011018425,156375721502624955046545, 99525811638120512862203505]