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A071973 as a simple table

n a(n)
0 0
1 2
2 4
3 11
4 25
5 62
6 162
7 433
8 1175
9 3229
10 9042
11 25549
12 73050
13 210356
14 610041
15 1779830
16 5218745
17 15372304
18 45455747
19 134882577
20 401480918
21 1198344171
22 3585783711
23 10754085805
24 32319203663
25 97312548674
26 293515297707

[0,2,4,11,25,62,162,433,1175,3229,9042,25549,
 73050,210356,610041,1779830,5218745,15372304,
 45455747,134882577,401480918,1198344171,
 3585783711,10754085805,32319203663,97312548674,
 293515297707]

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Last modified April 24 15:55 EDT 2014. Contains 240988 sequences.