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A007248 as a simple table

n a(n)
0 1
1 20
2 -62
3 216
4 -641
5 1636
6 -3778
7 8248
8 -17277
9 34664
10 -66878
11 125312
12 -229252
13 409676
14 -716420
15 1230328
16 -2079227
17 3460416
18 -5677816
19 9198424
20 -14729608
21 23328520
22 -36567242
23 56774712
24 -87369461
25 133321908
26 -201825396
27 303248408
28 -452431503

[1,20,-62,216,-641,1636,-3778,8248,-17277,34664,
 -66878,125312,-229252,409676,-716420,1230328,
 -2079227,3460416,-5677816,9198424,-14729608,
 23328520,-36567242,56774712,-87369461,133321908,
 -201825396,303248408,-452431503]

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Last modified December 14 05:17 EST 2018. Contains 318090 sequences. (Running on oeis4.)