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A045696 as a simple table

n a(n)
1 0
2 0
3 0
4 2
5 6
6 16
7 54
8 154
9 480
10 1418
11 4302
12 12836
13 38670
14 115802
15 347868
16 1042970
17 3130350
18 9389152
19 28171710
20 84509410
21 253541136
22 760606270
23 2281857318
24 6845520448
25 20536677354
26 61609877590
27 184829980176
28 554489476858
29 1663469474178
30 4990407031696

[0,0,0,2,6,16,54,154,480,1418,4302,12836,38670,
 115802,347868,1042970,3130350,9389152,28171710,
 84509410,253541136,760606270,2281857318,
 6845520448,20536677354,61609877590,184829980176,
 554489476858,1663469474178,4990407031696]

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Last modified November 27 12:51 EST 2021. Contains 349394 sequences. (Running on oeis4.)