A027499 - 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

A027499 as a simple table

n	a(n)
2	3
3	21
4	48
5	134
6	11475
7	1263600
8	52959452
9	33442462092
10	187693150315320
11	13385648916513731
12	160581632111860199668428
13	64508290858687331818199484720
14	62555685466184409014242480885950

[3,21,48,134,11475,1263600,52959452,33442462092, 187693150315320,13385648916513731, 160581632111860199668428, 64508290858687331818199484720, 62555685466184409014242480885950]