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A019242 as a simple table

n a(n)
3 0
4 3
5 2
6 10
7 10
8 19
9 50
10 86
11 184
12 436
13 980
14 2500
15 5890
16 15348
17 37898
18 96636
19 249382
20 637710
21 1643574
22 4245268
23 10925428
24 28374228
25 73419954
26 190918200
27 497509618
28 1298451532
29 3398193498
30 8910240128
31 23406398134

[0,3,2,10,10,19,50,86,184,436,980,2500,5890,15348,
 37898,96636,249382,637710,1643574,4245268,
 10925428,28374228,73419954,190918200,497509618,
 1298451532,3398193498,8910240128,23406398134]

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Last modified May 26 04:46 EDT 2019. Contains 323579 sequences. (Running on oeis4.)