A025967 - OEIS

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A025967 as a simple table

n	a(n)
0	1
1	21
2	289
3	3321
4	34705
5	343257
6	3282913
7	30740457
8	283960369
9	2599944633
10	23667405697
11	214622461833
12	1941330570193
13	17530479823449
14	158125883415841
15	1425244488222249
16	12839878208747377
17	115635005126816505

[1,21,289,3321,34705,343257,3282913,30740457, 283960369,2599944633,23667405697,214622461833, 1941330570193,17530479823449,158125883415841, 1425244488222249,12839878208747377, 115635005126816505]