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A268349 as a simple table

n a(n)
0 1
1 2
2 3
3 4
4 20
5 45
6 109
7 275
8 708
9 1765
10 4442
11 11196
12 28207
13 70985
14 178755
15 450130
16 1133423
17 2853888
18 7186144
19 18094709
20 45562353
21 114725755
22 288879164
23 727396569
24 1831581574
25 4611915224
26 11612784735
27 29240946181
28 73628587619
29 185396495082

[1,2,3,4,20,45,109,275,708,1765,4442,11196,28207,
 70985,178755,450130,1133423,2853888,7186144,
 18094709,45562353,114725755,288879164,727396569,
 1831581574,4611915224,11612784735,29240946181,
 73628587619,185396495082]

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Last modified February 24 03:21 EST 2018. Contains 299595 sequences. (Running on oeis4.)