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A143954 as a simple table

n a(n)
0 0
1 0
2 1
3 5
4 19
5 68
6 243
7 880
8 3233
9 12021
10 45119
11 170595
12 648787
13 2479057
14 9509627
15 36598497
16 141246127
17 546433952
18 2118424887
19 8227983472
20 32010173957
21 124715628852
22 486550020967
23 1900433894942
24 7431033132717
25 29085434212042

[0,0,1,5,19,68,243,880,3233,12021,45119,170595,
 648787,2479057,9509627,36598497,141246127,
 546433952,2118424887,8227983472,32010173957,
 124715628852,486550020967,1900433894942,
 7431033132717,29085434212042]

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Last modified May 27 21:52 EDT 2020. Contains 334671 sequences. (Running on oeis4.)