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A023034 as a simple table

n a(n)
9 1
10 9
11 45
12 165
13 495
14 1287
15 3003
16 6435
17 12870
18 24309
19 43758
20 75573
21 125970
22 203445
23 319770
24 490149
25 735471
26 1081080
27 1562274
28 2218788
29 3108105
30 4289133
31 5852925
32 7882290
33 10518255
34 13871286
35 18156204
36 23511345
37 30260340
38 38564262
39 48902997

[1,9,45,165,495,1287,3003,6435,12870,24309,43758,
 75573,125970,203445,319770,490149,735471,1081080,
 1562274,2218788,3108105,4289133,5852925,7882290,
 10518255,13871286,18156204,23511345,30260340,
 38564262,48902997]

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Last modified September 18 02:19 EDT 2020. Contains 337164 sequences. (Running on oeis4.)