A022748 - OEIS

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A022748 as a simple table

n	a(n)
0	1
1	24
2	348
3	3824
4	34974
5	279360
6	2007496
7	13236528
8	81211749
9	468506720
10	2561834052
11	13362262272
12	66823739654
13	321763781664
14	1497035306088
15	6750151072304
16	29572851319506
17	126163172338056
18	525134328872668

[1,24,348,3824,34974,279360,2007496,13236528, 81211749,468506720,2561834052,13362262272, 66823739654,321763781664,1497035306088, 6750151072304,29572851319506,126163172338056, 525134328872668]