A274730 - OEIS

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A274730 as a simple table

n	a(n)
1	8
2	144
3	1040
4	9308
5	84948
6	771300
7	7016284
8	63780144
9	579907180
10	5272264616
11	47934377596
12	435805897172
13	3962236677384
14	36023613993928
15	327517339347916
16	2977702208511048
17	27072492754395896
18	246136048094770872

[8,144,1040,9308,84948,771300,7016284,63780144, 579907180,5272264616,47934377596,435805897172, 3962236677384,36023613993928,327517339347916, 2977702208511048,27072492754395896, 246136048094770872]