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A019261 as a simple table

n a(n)
3 2
4 0
5 0
6 0
7 0
8 0
9 24
10 92
11 208
12 456
13 1052
14 2304
15 5424
16 14064
17 36760
18 94848
19 243504
20 621372
21 1579076
22 4025368
23 10328704
24 26662992
25 69160532
26 179992732
27 469533708
28 1227334180
29 3213949204
30 8431713740
31 22166361808

[2,0,0,0,0,0,24,92,208,456,1052,2304,5424,14064,
 36760,94848,243504,621372,1579076,4025368,
 10328704,26662992,69160532,179992732,469533708,
 1227334180,3213949204,8431713740,22166361808]

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Last modified November 28 21:30 EST 2021. Contains 349415 sequences. (Running on oeis4.)