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A320827 as a simple table

n a(n)
0 -1
1 1
2 1
3 3
4 11
5 41
6 151
7 549
8 1977
9 7075
10 25229
11 89831
12 319881
13 1140523
14 4075321
15 14603243
16 52501659
17 189440937
18 686181711
19 2495243373
20 9109701699
21 33388293177
22 122840931891
23 453622854873
24 1681057537359
25 6250742452125
26 23316503569983
27 87236431248445

[-1,1,1,3,11,41,151,549,1977,7075,25229,89831,
 319881,1140523,4075321,14603243,52501659,
 189440937,686181711,2495243373,9109701699,
 33388293177,122840931891,453622854873,
 1681057537359,6250742452125,23316503569983,
 87236431248445]

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Last modified July 22 21:11 EDT 2024. Contains 374544 sequences. (Running on oeis4.)