A117429 - 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

A117429 as a simple table

n	a(n)
0	4
1	4
2	25
3	123
4	626
5	3127
6	15623
7	78123
8	390623
9	1953122
10	9765627
11	48828127
12	244140623
13	1220703121
14	6103515629
15	30517578127
16	152587890617
17	762939453119
18	3814697265623
19	19073486328122
20	95367431640623

[4,4,25,123,626,3127,15623,78123,390623,1953122, 9765627,48828127,244140623,1220703121,6103515629, 30517578127,152587890617,762939453119, 3814697265623,19073486328122,95367431640623]