A253029 - OEIS

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A253029 as a simple table

n	a(n)
1	297
2	1647
3	9126
4	50571
5	280233
6	1552878
7	8605089
8	47684079
9	264235662
10	1464230547
11	8113859721
12	44961990246
13	249151530393
14	1380643622703
15	7650672704694
16	42395294391579
17	234928490071977
18	1301828333534622

[297,1647,9126,50571,280233,1552878,8605089, 47684079,264235662,1464230547,8113859721, 44961990246,249151530393,1380643622703, 7650672704694,42395294391579,234928490071977, 1301828333534622]