A299296 - OEIS

A299296 as a simple table

n	a(n)
0	1
1	2
2	7
3	30
4	140
5	684
6	3440
7	17652
8	91936
9	484356
10	2575280
11	13795668
12	74367408
13	403026372
14	2194186272
15	11993494356
16	65787201984
17	361983246084
18	1997299980368
19	11048026950228
20	61250480822416
21	340274092662084
22	1893939042807872
23	10559753415822420
24	58970301517748000

[1,2,7,30,140,684,3440,17652,91936,484356,2575280, 13795668,74367408,403026372,2194186272, 11993494356,65787201984,361983246084, 1997299980368,11048026950228,61250480822416, 340274092662084,1893939042807872, 10559753415822420,58970301517748000]

[1,2,7,30,140,684,3440,17652,91936,484356,2575280,
 13795668,74367408,403026372,2194186272,
 11993494356,65787201984,361983246084,
 1997299980368,11048026950228,61250480822416,
 340274092662084,1893939042807872,
 10559753415822420,58970301517748000]