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A094780 as a simple table

n a(n)
0 0
1 0
2 2
3 12
4 58
5 4
6 100
7 664
8 3514
9 16916
10 77388
11 343144
12 1490148
13 6376616
14 26992264
15 113317936
16 472661434
17 1961361076
18 8104733884
19 33374212936
20 137031378124
21 11497939448
22 94924291832
23 562662294608
24 2936768405732
25 14326881917576
26 67031420473208
27 304860388037136

[0,0,2,12,58,4,100,664,3514,16916,77388,343144,
 1490148,6376616,26992264,113317936,472661434,
 1961361076,8104733884,33374212936,137031378124,
 11497939448,94924291832,562662294608,
 2936768405732,14326881917576,67031420473208,
 304860388037136]

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Last modified February 27 06:03 EST 2020. Contains 332299 sequences. (Running on oeis4.)