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A121253 as a simple table

n a(n)
0 0
1 0
2 0
3 1
4 1
5 1
6 2
7 3
8 4
9 9
10 28
11 113
12 1018
13 28505
14 3221066
15 3279045189
16 93469183112446
17 301070407771273987437
18 987223472152664180906141290594
19 92274971491542102812339702600558728264132925

[0,0,0,1,1,1,2,3,4,9,28,113,1018,28505,3221066,
 3279045189,93469183112446,301070407771273987437,
 987223472152664180906141290594,
 92274971491542102812339702600558728264132925]

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Last modified August 11 19:17 EDT 2024. Contains 375073 sequences. (Running on oeis4.)