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A276666 as a simple table

n a(n)
0 -1
1 0
2 2
3 10
4 42
5 168
6 660
7 2574
8 10010
9 38896
10 151164
11 587860
12 2288132
13 8914800
14 34767720
15 135727830
16 530365050
17 2074316640
18 8119857900
19 31810737420
20 124718287980
21 489325340400
22 1921133836440
23 7547311500300
24 29667795388452
25 116686713634848
26 459183826803800

[-1,0,2,10,42,168,660,2574,10010,38896,151164,
 587860,2288132,8914800,34767720,135727830,
 530365050,2074316640,8119857900,31810737420,
 124718287980,489325340400,1921133836440,
 7547311500300,29667795388452,116686713634848,
 459183826803800]

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Last modified October 18 12:18 EDT 2019. Contains 328160 sequences. (Running on oeis4.)