A155673 - OEIS

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A155673 as a simple table

n	a(n)
0	1
1	20
2	220
3	2330
4	24640
5	261050
6	2771560
7	29487170
8	314358880
9	3357947690
10	35937424600
11	385311670610
12	4138428376720
13	44522712143930
14	479749833583240
15	5177248169415650
16	55949729863572160
17	605447028499293770

[1,20,220,2330,24640,261050,2771560,29487170, 314358880,3357947690,35937424600,385311670610, 4138428376720,44522712143930,479749833583240, 5177248169415650,55949729863572160, 605447028499293770]