A021021 - 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

A021021 as a simple table

n	a(n)
0	1
1	33
2	727
3	13365
4	221431
5	3428733
6	50631967
7	721942485
8	10021257511
9	136192514733
10	1819621847407
11	23973890545605
12	312209398691191
13	4026262617877533
14	51492399583946047
15	653858524870924725

[1,33,727,13365,221431,3428733,50631967,721942485, 10021257511,136192514733,1819621847407, 23973890545605,312209398691191,4026262617877533, 51492399583946047,653858524870924725]