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A148953 as a simple table

n a(n)
0 1
1 1
2 3
3 9
4 30
5 103
6 384
7 1442
8 5630
9 22140
10 89391
11 362567
12 1496206
13 6200980
14 26010002
15 109530531
16 465203693
17 1983050889
18 8507197775
19 36615589619
20 158370065466
21 686997801100
22 2991781230521
23 13062875230227
24 57217563779248
25 251205593841622
26 1105814802393350
27 4877926862758847
28 21565940667871892

[1,1,3,9,30,103,384,1442,5630,22140,89391,362567,
 1496206,6200980,26010002,109530531,465203693,
 1983050889,8507197775,36615589619,158370065466,
 686997801100,2991781230521,13062875230227,
 57217563779248,251205593841622,1105814802393350,
 4877926862758847,21565940667871892]

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Last modified May 21 14:17 EDT 2013. Contains 225503 sequences.