A008386 - OEIS

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A008386 as a simple table

n	a(n)
0	1
1	31
2	271
3	1281
4	4251
5	11253
6	25493
7	51563
8	95693
9	166003
10	272755
11	428605
12	648855
13	951705
14	1358505
15	1894007
16	2586617
17	3468647
18	4576567
19	5951257
20	7638259
21	9688029
22	12156189
23	15103779
24	18597509

[1,31,271,1281,4251,11253,25493,51563,95693, 166003,272755,428605,648855,951705,1358505, 1894007,2586617,3468647,4576567,5951257,7638259, 9688029,12156189,15103779,18597509]