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A127275 as a simple table

n a(n)
0 1
1 1
2 2
3 4
4 6
5 -4
6 -100
7 -664
8 -3514
9 -16916
10 -77388
11 -343144
12 -1490148
13 -6376616
14 -26992264
15 -113317936
16 -472661434
17 -1961361076
18 -8104733884
19 -33374212936
20 -137031378124
21 -561253753336
22 -2293947547384
23 -9358755316816
24 -38121140494564
25 -155064370272904

[1,1,2,4,6,-4,-100,-664,-3514,-16916,-77388,
 -343144,-1490148,-6376616,-26992264,-113317936,
 -472661434,-1961361076,-8104733884,-33374212936,
 -137031378124,-561253753336,-2293947547384,
 -9358755316816,-38121140494564,-155064370272904]

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Last modified July 9 04:51 EDT 2020. Contains 335538 sequences. (Running on oeis4.)