A091354 - 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

A091354 as a simple table

n	a(n)
0	1
1	4
2	16
3	70
4	344
5	1908
6	11904
7	83028
8	642960
9	5490560
10	51373420
11	523581128
12	5781166688
13	68819889018
14	879350377816
15	12012238559559
16	174794145558664
17	2700485871440464
18	44163954923956850
19	762460145368056070

[1,4,16,70,344,1908,11904,83028,642960,5490560, 51373420,523581128,5781166688,68819889018, 879350377816,12012238559559,174794145558664, 2700485871440464,44163954923956850, 762460145368056070]