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A181480 as a simple table

n a(n)
0 1
1 8
2 64
3 344
4 1744
5 7400
6 29632
7 106808
8 366088
9 1168008
10 3570240
11 10347864
12 28915056
13 77493096
14 201249216
15 505130808
16 1233655332
17 2927916264
18 6784208704
19 15338678264
20 33950726992
21 73557910088
22 156378379456
23 326236930136

[1,8,64,344,1744,7400,29632,106808,366088,1168008,
 3570240,10347864,28915056,77493096,201249216,
 505130808,1233655332,2927916264,6784208704,
 15338678264,33950726992,73557910088,156378379456,
 326236930136]

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Last modified December 9 20:00 EST 2016. Contains 278986 sequences.