A270318 - OEIS

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A270318 as a simple table

n	a(n)
0	1
1	8
2	44
3	209
4	892
5	3749
6	15160
7	61205
8	245509
9	985328
10	3942373
11	15778036
12	63142628
13	252596776
14	1010495385
15	4042114757

[1,8,44,209,892,3749,15160,61205,245509,985328, 3942373,15778036,63142628,252596776,1010495385, 4042114757]