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A158495 as a simple table

n a(n)
0 1
1 -1
2 -3
3 -8
4 -21
5 -56
6 -154
7 -440
8 -1309
9 -4048
10 -12958
11 -42712
12 -144210
13 -496432
14 -1735764
15 -6145968
16 -21986781
17 -79331232
18 -288307254
19 -1054253208
20 -3875769606
21 -14315659632
22 -53097586284
23 -197677736208
24 -738415086066

[1,-1,-3,-8,-21,-56,-154,-440,-1309,-4048,-12958,
 -42712,-144210,-496432,-1735764,-6145968,
 -21986781,-79331232,-288307254,-1054253208,
 -3875769606,-14315659632,-53097586284,
 -197677736208,-738415086066]

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Last modified January 19 09:35 EST 2020. Contains 331048 sequences. (Running on oeis4.)