A171470 - OEIS

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A171470 as a simple table

n	a(n)
0	11
1	90
2	372
3	1512
4	6096
5	24480
6	98112
7	392832
8	1572096
9	6289920
10	25162752
11	100657152
12	402640896
13	1610588160
14	6442401792
15	25769705472
16	103079018496
17	412316467200
18	1649266655232
19	6597068193792
20	26388275920896

[11,90,372,1512,6096,24480,98112,392832,1572096, 6289920,25162752,100657152,402640896,1610588160, 6442401792,25769705472,103079018496,412316467200, 1649266655232,6597068193792,26388275920896]