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A001297 as a simple table

n a(n)
0 0
1 1
2 15
3 90
4 350
5 1050
6 2646
7 5880
8 11880
9 22275
10 39325
11 66066
12 106470
13 165620
14 249900
15 367200
16 527136
17 741285
18 1023435
19 1389850
20 1859550
21 2454606
22 3200450
23 4126200
24 5265000
25 6654375
26 8336601
27 10359090
28 12774790
29 15642600
30 19027800

[0,1,15,90,350,1050,2646,5880,11880,22275,39325,
 66066,106470,165620,249900,367200,527136,741285,
 1023435,1389850,1859550,2454606,3200450,4126200,
 5265000,6654375,8336601,10359090,12774790,
 15642600,19027800]

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Last modified February 22 23:03 EST 2019. Contains 320411 sequences. (Running on oeis4.)