A011893 - OEIS

A011893 as a simple table

n	a(n)
0	0
1	0
2	0
3	0
4	2
5	5
6	10
7	19
8	30
9	45
10	65
11	90
12	120
13	156
14	198
15	248
16	305
17	370
18	445
19	528
20	621
21	725
22	840
23	966
24	1104
25	1254
26	1418
27	1595
28	1786
29	1993
30	2214
31	2451
32	2705
33	2976
34	3264
35	3570
36	3894
37	4238
38	4601
39	4984
40	5389
41	5814
42	6261
43	6731
44	7224
45	7740
46	8280
47	8844
48	9434
49	10049
50	10690

[0,0,0,0,2,5,10,19,30,45,65,90,120,156,198,248, 305,370,445,528,621,725,840,966,1104,1254,1418, 1595,1786,1993,2214,2451,2705,2976,3264,3570,3894, 4238,4601,4984,5389,5814,6261,6731,7224,7740,8280, 8844,9434,10049,10690]