A102860 - cp's OEIS frontend

A102860 Number of ways to change three non-identical letters in the word aabbccdd..., where there are n types of letters.

n	a(n)
2	0
3	16
4	64
5	160
6	320
7	560
8	896
9	1344
10	1920
11	2640
12	3520
13	4576
14	5824
15	7280
16	8960
17	10880
18	13056
19	15504
20	18240
21	21280
22	24640
23	28336
24	32384
25	36800
26	41600
27	46800
28	52416
29	58464
30	64960
31	71920
32	79360
33	87296
34	95744
35	104720
36	114240
37	124320
38	134976
39	146224

[0, 16, 64, 160, 320, 560, 896, 1344, 1920, 2640, 3520, 4576, 5824, 7280, 8960, 10880, 13056, 15504, 18240, 21280, 24640, 28336, 32384, 36800, 41600, 46800, 52416, 58464, 64960, 71920, 79360, 87296, 95744, 104720, 114240, 124320, 134976, 146224]

cp's OEIS Frontend

A102860 Number of ways to change three non-identical letters in the word aabbccdd..., where there are n types of letters.

Table of values

List of values