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A140824 as a simple table

n a(n)
0 0
1 1
2 3
3 6
4 15
5 41
6 108
7 281
8 735
9 1926
10 5043
11 13201
12 34560
13 90481
14 236883
15 620166
16 1623615
17 4250681
18 11128428
19 29134601
20 76275375
21 199691526
22 522799203
23 1368706081
24 3583319040
25 9381251041
26 24560434083
27 64300051206
28 168339719535
29 440719107401
30 1153817602668

[0,1,3,6,15,41,108,281,735,1926,5043,13201,34560,
 90481,236883,620166,1623615,4250681,11128428,
 29134601,76275375,199691526,522799203,1368706081,
 3583319040,9381251041,24560434083,64300051206,
 168339719535,440719107401,1153817602668]

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Last modified May 24 14:49 EDT 2019. Contains 323532 sequences. (Running on oeis4.)