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A253409 as a simple table

n a(n)
0 1
1 2
2 4
3 10
4 28
5 86
6 282
7 984
8 3630
9 14138
10 57904
11 248854
12 1118554
13 5246980
14 25619018
15 129961850
16 683561488
17 3722029314
18 20946195078
19 121671375312
20 728511702462
21 4491224518274
22 28475638336144
23 185499720543262
24 1240358846060122
25 8505894459387628
26 59771243719783410

[1,2,4,10,28,86,282,984,3630,14138,57904,248854,
 1118554,5246980,25619018,129961850,683561488,
 3722029314,20946195078,121671375312,728511702462,
 4491224518274,28475638336144,185499720543262,
 1240358846060122,8505894459387628,
 59771243719783410]

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Last modified February 19 16:58 EST 2019. Contains 320311 sequences. (Running on oeis4.)