A213840 - cp's OEIS frontend

A213840 a(n) = n(1 + n)(3 - 4n + 4n^2)/6.

n	a(n)
1	1
2	11
3	54
4	170
5	415
6	861
7	1596
8	2724
9	4365
10	6655
11	9746
12	13806
13	19019
14	25585
15	33720
16	43656
17	55641
18	69939
19	86830
20	106610
21	129591
22	156101
23	186484
24	221100
25	260325
26	304551
27	354186
28	409654
29	471395
30	539865
31	615536
32	698896
33	790449
34	890715
35	1000230
36	1119546
37	1249231

[1, 11, 54, 170, 415, 861, 1596, 2724, 4365, 6655, 9746, 13806, 19019, 25585, 33720, 43656, 55641, 69939, 86830, 106610, 129591, 156101, 186484, 221100, 260325, 304551, 354186, 409654, 471395, 539865, 615536, 698896, 790449, 890715, 1000230, 1119546, 1249231]

cp's OEIS Frontend

A213840 a(n) = n(1 + n)(3 - 4n + 4n^2)/6.

Table of values

List of values

cp's OEIS Frontend

A213840 a(n) = n*(1 + n)*(3 - 4*n + 4*n^2)/6.

Table of values

List of values

A213840 a(n) = n(1 + n)(3 - 4n + 4n^2)/6.