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A199853 as a simple table

n a(n)
0 1
1 -1
2 -1
3 -3
4 -6
5 -14
6 -31
7 -70
8 -157
9 -353
10 -793
11 -1782
12 -4004
13 -8997
14 -20216
15 -45425
16 -102069
17 -229347
18 -515338
19 -1157954
20 -2601899
21 -5846414
22 -13136773
23 -29518061
24 -66326481
25 -149034250
26 -334876920
27 -752461609
28 -1690765888
29 -3799116465
30 -8536537209

[1,-1,-1,-3,-6,-14,-31,-70,-157,-353,-793,-1782,
 -4004,-8997,-20216,-45425,-102069,-229347,-515338,
 -1157954,-2601899,-5846414,-13136773,-29518061,
 -66326481,-149034250,-334876920,-752461609,
 -1690765888,-3799116465,-8536537209]

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Last modified March 28 10:55 EDT 2024. Contains 371241 sequences. (Running on oeis4.)