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A274295 as a simple table

n a(n)
0 1
1 1
2 3
3 6
4 16
5 43
6 120
7 369
8 1244
9 4449
10 16424
11 61645
12 233568
13 890421
14 3409866
15 13105083
16 50517580
17 195234557
18 756198408
19 2934687173
20 11408742152
21 44420399805
22 173191793402
23 676104404123
24 2642356839108
25 10337529692357
26 40481034411830
27 158658210122079
28 622329139387184
29 2442857958597649

[1,1,3,6,16,43,120,369,1244,4449,16424,61645,
 233568,890421,3409866,13105083,50517580,195234557,
 756198408,2934687173,11408742152,44420399805,
 173191793402,676104404123,2642356839108,
 10337529692357,40481034411830,158658210122079,
 622329139387184,2442857958597649]

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Last modified January 19 00:40 EST 2020. Contains 331030 sequences. (Running on oeis4.)