A227970 - cp's OEIS frontend

A227970 Triangular arithmetic on half-squares: b(n)*(b(n) - 1)/2 where b(n) = floor(n^2/2).

n	a(n)
0	0
1	0
2	1
3	6
4	28
5	66
6	153
7	276
8	496
9	780
10	1225
11	1770
12	2556
13	3486
14	4753
15	6216
16	8128
17	10296
18	13041
19	16110
20	19900
21	24090
22	29161
23	34716
24	41328
25	48516
26	56953
27	66066
28	76636
29	87990
30	101025
31	114960
32	130816
33	147696
34	166753
35	186966
36	209628
37	233586
38	260281
39	288420
40	319600
41	352380
42	388521
43	426426

[0, 0, 1, 6, 28, 66, 153, 276, 496, 780, 1225, 1770, 2556, 3486, 4753, 6216, 8128, 10296, 13041, 16110, 19900, 24090, 29161, 34716, 41328, 48516, 56953, 66066, 76636, 87990, 101025, 114960, 130816, 147696, 166753, 186966, 209628, 233586, 260281, 288420, 319600, 352380, 388521, 426426]

cp's OEIS Frontend

A227970 Triangular arithmetic on half-squares: b(n)*(b(n) - 1)/2 where b(n) = floor(n^2/2).

Table of values

List of values