A135905 - OEIS

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A135905 as a simple table

n	a(n)
0	1
1	4
2	24
3	186
4	1736
5	18754
6	228658
7	3092316
8	45802294
9	735881882
10	12727541778
11	235515880084
12	4638914346322
13	96840935881898
14	2134717733185118
15	49529467079270060
16	1206148832249659798
17	30751284267472226682

[1,4,24,186,1736,18754,228658,3092316,45802294, 735881882,12727541778,235515880084,4638914346322, 96840935881898,2134717733185118,49529467079270060, 1206148832249659798,30751284267472226682]