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A149950 as a simple table

n a(n)
0 1
1 2
2 5
3 15
4 50
5 175
6 643
7 2442
8 9497
9 37772
10 152799
11 626592
12 2602438
13 10922440
14 46249757
15 197449903
16 848960606
17 3672993876
18 15982347311
19 69901749199
20 307137650010
21 1355254986715
22 6003323405960
23 26686855461722
24 119021651507968
25 532439628200272
26 2388526982109443
27 10742935351026098

[1,2,5,15,50,175,643,2442,9497,37772,152799,
 626592,2602438,10922440,46249757,197449903,
 848960606,3672993876,15982347311,69901749199,
 307137650010,1355254986715,6003323405960,
 26686855461722,119021651507968,532439628200272,
 2388526982109443,10742935351026098]

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Last modified May 21 02:55 EDT 2019. Contains 323434 sequences. (Running on oeis4.)