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A026965 as a simple table

n a(n)
0 1
1 3
2 10
3 25
4 66
5 154
6 360
7 810
8 1810
9 3982
10 8700
11 18850
12 40614
13 87030
14 185680
15 394570
16 835578
17 1763998
18 3713700
19 7798770
20 16340302
21 34166086
22 71303160
23 148548250
24 308980386
25 641728494
26 1330992460
27 2757055810
28 5704253430

[1,3,10,25,66,154,360,810,1810,3982,8700,18850,
 40614,87030,185680,394570,835578,1763998,3713700,
 7798770,16340302,34166086,71303160,148548250,
 308980386,641728494,1330992460,2757055810,
 5704253430]

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Last modified May 25 01:00 EDT 2022. Contains 354047 sequences. (Running on oeis4.)