A247643 - cp's OEIS frontend

A247643 a(n) = ( 10n(n+1)+(2n+1)(-1)^n+7 )/8.

n	a(n)
0	1
1	3
2	9
3	15
4	27
5	37
6	55
7	69
8	93
9	111
10	141
11	163
12	199
13	225
14	267
15	297
16	345
17	379
18	433
19	471
20	531
21	573
22	639
23	685
24	757
25	807
26	885
27	939
28	1023
29	1081
30	1171
31	1233
32	1329
33	1395
34	1497
35	1567
36	1675
37	1749
38	1863
39	1941
40	2061
41	2143
42	2269
43	2355
44	2487
45	2577
46	2715
47	2809
48	2953
49	3051

[1, 3, 9, 15, 27, 37, 55, 69, 93, 111, 141, 163, 199, 225, 267, 297, 345, 379, 433, 471, 531, 573, 639, 685, 757, 807, 885, 939, 1023, 1081, 1171, 1233, 1329, 1395, 1497, 1567, 1675, 1749, 1863, 1941, 2061, 2143, 2269, 2355, 2487, 2577, 2715, 2809, 2953, 3051]

cp's OEIS Frontend

A247643 a(n) = ( 10n(n+1)+(2n+1)(-1)^n+7 )/8.

Table of values

List of values

cp's OEIS Frontend

A247643 a(n) = ( 10*n*(n+1)+(2*n+1)*(-1)^n+7 )/8.

Table of values

List of values

A247643 a(n) = ( 10n(n+1)+(2n+1)(-1)^n+7 )/8.