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A018212 as a simple table

n a(n)
0 1
1 5
2 25
3 85
4 255
5 651
6 1519
7 3235
8 6470
9 12190
10 21942
11 37854
12 63090
13 101850
14 160050
15 245322
16 367983
17 541035
18 781495
19 1110395
20 1554553
21 2146573
22 2927145
23 3945045
24 5260060
25 6942988
26 9079292
27 11769100
28 15131700
29 19305540

[1,5,25,85,255,651,1519,3235,6470,12190,21942,
 37854,63090,101850,160050,245322,367983,541035,
 781495,1110395,1554553,2146573,2927145,3945045,
 5260060,6942988,9079292,11769100,15131700,
 19305540]

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Last modified February 21 12:10 EST 2018. Contains 299411 sequences. (Running on oeis4.)