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A259709 as a simple table

n a(n)
1 0
2 -1
3 0
4 4
5 22
6 78
7 240
8 679
9 1828
10 4762
11 12132
12 30432
13 75504
14 185875
15 455040
16 1109540
17 2697698
18 6545670
19 15859128
20 38384099
21 92832716
22 224399570
23 542226888
24 1309862496
25 3163659744
26 7640066759
27 18448657344
28 44545569508
29 107553559150
30 259675788510

[0,-1,0,4,22,78,240,679,1828,4762,12132,30432,
 75504,185875,455040,1109540,2697698,6545670,
 15859128,38384099,92832716,224399570,542226888,
 1309862496,3163659744,7640066759,18448657344,
 44545569508,107553559150,259675788510]

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Last modified September 28 02:07 EDT 2020. Contains 337392 sequences. (Running on oeis4.)