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A027561 as a simple table

n a(n)
0 0
1 0
2 0
3 0
4 0
5 2
6 6
7 22
8 56
9 152
10 356
11 858
12 1914
13 4334
14 9372
15 20440
16 43280
17 92114
18 192182
19 402246
20 830328
21 1717496
22 3517668
23 7214218
24 14689994
25 29938526
26 60697148
27 123127224
28 248807472
29 502963778
30 1013829414
31 2044098166

[0,0,0,0,0,2,6,22,56,152,356,858,1914,4334,9372,
 20440,43280,92114,192182,402246,830328,1717496,
 3517668,7214218,14689994,29938526,60697148,
 123127224,248807472,502963778,1013829414,
 2044098166]

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Last modified March 29 08:13 EDT 2024. Contains 371265 sequences. (Running on oeis4.)