A213839 - OEIS

A213839 as a simple table

n	a(n)
1	1
2	20
3	89
4	240
5	505
6	916
7	1505
8	2304
9	3345
10	4660
11	6281
12	8240
13	10569
14	13300
15	16465
16	20096
17	24225
18	28884
19	34105
20	39920
21	46361
22	53460
23	61249
24	69760
25	79025
26	89076
27	99945
28	111664
29	124265
30	137780
31	152241
32	167680

[1,20,89,240,505,916,1505,2304,3345,4660,6281, 8240,10569,13300,16465,20096,24225,28884,34105, 39920,46361,53460,61249,69760,79025,89076,99945, 111664,124265,137780,152241,167680]