A042500 - OEIS

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A042500 as a simple table

n	a(n)
0	27
1	28
2	251
3	781
4	4156
5	4937
6	38715
7	275942
8	314657
9	1849227
10	5862338
11	48747931
12	54610269
13	2997702457
14	3052312726
15	27416204265
16	85300925521
17	453920831870
18	539221757391
19	4228473133607
20	30138533692640

[27,28,251,781,4156,4937,38715,275942,314657, 1849227,5862338,48747931,54610269,2997702457, 3052312726,27416204265,85300925521,453920831870, 539221757391,4228473133607,30138533692640]