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A002420 as a simple table

n a(n)
0 1
1 -2
2 -2
3 -4
4 -10
5 -28
6 -84
7 -264
8 -858
9 -2860
10 -9724
11 -33592
12 -117572
13 -416024
14 -1485800
15 -5348880
16 -19389690
17 -70715340
18 -259289580
19 -955277400
20 -3534526380
21 -13128240840
22 -48932534040
23 -182965127280
24 -686119227300
25 -2579808294648
26 -9723892802904
27 -36734706144304

[1,-2,-2,-4,-10,-28,-84,-264,-858,-2860,-9724,
 -33592,-117572,-416024,-1485800,-5348880,
 -19389690,-70715340,-259289580,-955277400,
 -3534526380,-13128240840,-48932534040,
 -182965127280,-686119227300,-2579808294648,
 -9723892802904,-36734706144304]

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Last modified October 21 11:10 EDT 2018. Contains 316414 sequences. (Running on oeis4.)