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A277973 as a simple table

n a(n)
1 0
2 0
3 0
4 1
5 6
6 25
7 91
8 311
9 1029
10 3346
11 10778
12 34544
13 110444
14 352785
15 1126885
16 3601617
17 11521648
18 36899528
19 118322448
20 379908707
21 1221423149
22 3932113059
23 12675055399
24 40909511880
25 132200481507
26 427718677728
27 1385419058692
28 4492446685542
29 14582927712740
30 47385785436719

[0,0,0,1,6,25,91,311,1029,3346,10778,34544,110444,
 352785,1126885,3601617,11521648,36899528,
 118322448,379908707,1221423149,3932113059,
 12675055399,40909511880,132200481507,427718677728,
 1385419058692,4492446685542,14582927712740,
 47385785436719]

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Last modified July 15 22:48 EDT 2019. Contains 325061 sequences. (Running on oeis4.)