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A306519 as a simple table

n a(n)
0 1
1 0
2 2
3 4
4 16
5 56
6 216
7 848
8 3424
9 14080
10 58816
11 248832
12 1064064
13 4591744
14 19970432
15 87448832
16 385226240
17 1705979904
18 7590632448
19 33916934144
20 152128126976
21 684702330880
22 3091429158912
23 13997970530304
24 63550155145216
25 289216809762816
26 1319185060069376
27 6029646893252608

[1,0,2,4,16,56,216,848,3424,14080,58816,248832,
 1064064,4591744,19970432,87448832,385226240,
 1705979904,7590632448,33916934144,152128126976,
 684702330880,3091429158912,13997970530304,
 63550155145216,289216809762816,1319185060069376,
 6029646893252608]

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Last modified June 25 10:29 EDT 2019. Contains 324351 sequences. (Running on oeis4.)