A121803 - 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

A121803 as a simple table

n	a(n)
1	0
2	28
3	432
4	2083
5	11262
6	54976
7	274107
8	1345543
9	6629946
10	32586349
11	160268532
12	787926091
13	3874117269
14	19047230005
15	93648237255
16	460429207264
17	2263745709876
18	11129911057732
19	54721250218635
20	269042081326366

[0,28,432,2083,11262,54976,274107,1345543,6629946, 32586349,160268532,787926091,3874117269, 19047230005,93648237255,460429207264, 2263745709876,11129911057732,54721250218635, 269042081326366]