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A150274 as a simple table

n a(n)
0 1
1 2
2 6
3 22
4 94
5 370
6 1682
7 7138
8 32882
9 146614
10 682866
11 3120066
12 14730854
13 68233982
14 325456138
15 1524123022
16 7313477578
17 34576073774
18 166582262834
19 793435987550
20 3836131459466
21 18373065673338
22 89115810052902
23 428673021509750
24 2084820152654090
25 10065304671767582
26 49058336646592546
27 237596508078093598

[1,2,6,22,94,370,1682,7138,32882,146614,682866,
 3120066,14730854,68233982,325456138,1524123022,
 7313477578,34576073774,166582262834,793435987550,
 3836131459466,18373065673338,89115810052902,
 428673021509750,2084820152654090,
 10065304671767582,49058336646592546,
 237596508078093598]

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Last modified December 2 07:40 EST 2020. Contains 338868 sequences. (Running on oeis4.)