A024440 - OEIS

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A024440 as a simple table

n	a(n)
0	1
1	28
2	521
3	8132
4	115425
5	1547436
6	20005177
7	252510484
8	3136438289
9	38534838524
10	469928249193
11	5701527366756
12	68933583580993
13	831438081590092
14	10011928868278169
15	120426060354676148
16	1447414807491149937

[1,28,521,8132,115425,1547436,20005177,252510484, 3136438289,38534838524,469928249193,5701527366756, 68933583580993,831438081590092,10011928868278169, 120426060354676148,1447414807491149937]