A024434 - OEIS

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A024434 as a simple table

n	a(n)
0	1
1	28
2	521
3	8120
4	114765
5	1526196
6	19481953
7	241575376
8	2932083605
9	35012557580
10	412807072041
11	4818002535528
12	55771887460381
13	641245030592740
14	7331332058802545
15	83421584091633536
16	945410124787913253

[1,28,521,8120,114765,1526196,19481953,241575376, 2932083605,35012557580,412807072041,4818002535528, 55771887460381,641245030592740,7331332058802545, 83421584091633536,945410124787913253]