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A273720 as a simple table

n a(n)
2 1
3 3
4 8
5 21
6 57
7 162
8 479
9 1458
10 4528
11 14259
12 45349
13 145289
14 468121
15 1515128
16 4922145
17 16040310
18 52411294
19 171646085
20 563266323
21 1851661113
22 6096654978
23 20101681834
24 66362538332
25 219336702948
26 725692113292
27 2403295565913
28 7966021263923
29 26425616887971

[1,3,8,21,57,162,479,1458,4528,14259,45349,145289,
 468121,1515128,4922145,16040310,52411294,
 171646085,563266323,1851661113,6096654978,
 20101681834,66362538332,219336702948,725692113292,
 2403295565913,7966021263923,26425616887971]

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Last modified November 21 01:33 EST 2019. Contains 329349 sequences. (Running on oeis4.)