A266760 - OEIS

A266760 as a simple table

n	a(n)
0	1
1	6
2	20
3	51
4	111
5	216
6	386
7	646
8	1026
9	1560
10	2287
11	3251
12	4500
13	6086
14	8066
15	10502
16	13460
17	17011
18	21231
19	26200
20	32002
21	38726
22	46466
23	55320
24	65391
25	76787
26	89620
27	104006
28	120066
29	137926
30	157716
31	179571
32	203631
33	230040
34	258946
35	290502
36	324866
37	362200
38	402671
39	446451
40	493716
41	544646
42	599426
43	658246
44	721300
45	788787
46	860911
47	937880
48	1019906

[1,6,20,51,111,216,386,646,1026,1560,2287,3251, 4500,6086,8066,10502,13460,17011,21231,26200, 32002,38726,46466,55320,65391,76787,89620,104006, 120066,137926,157716,179571,203631,230040,258946, 290502,324866,362200,402671,446451,493716,544646, 599426,658246,721300,788787,860911,937880,1019906]