A131805 - cp's OEIS frontend

A131805 Row sums of triangular array T: T(j,k) = -(k+1)/2 for odd k, T(j,k) = 0 for k = 0, T(j,k) = j+1-k/2 for even k > 0; 0 <= k <= j.

n	a(n)
0	0
1	-1
2	1
3	0
4	4
5	3
6	9
7	8
8	16
9	15
10	25
11	24
12	36
13	35
14	49
15	48
16	64
17	63
18	81
19	80
20	100
21	99
22	121
23	120
24	144
25	143
26	169
27	168
28	196
29	195
30	225
31	224
32	256
33	255
34	289
35	288
36	324
37	323
38	361
39	360
40	400
41	399
42	441
43	440
44	484
45	483
46	529
47	528
48	576
49	575
50	625
51	624
52	676
53	675
54	729
55	728
56	784
57	783
58	841

[0, -1, 1, 0, 4, 3, 9, 8, 16, 15, 25, 24, 36, 35, 49, 48, 64, 63, 81, 80, 100, 99, 121, 120, 144, 143, 169, 168, 196, 195, 225, 224, 256, 255, 289, 288, 324, 323, 361, 360, 400, 399, 441, 440, 484, 483, 529, 528, 576, 575, 625, 624, 676, 675, 729, 728, 784, 783, 841]

cp's OEIS Frontend

A131805 Row sums of triangular array T: T(j,k) = -(k+1)/2 for odd k, T(j,k) = 0 for k = 0, T(j,k) = j+1-k/2 for even k > 0; 0 <= k <= j.

Table of values

List of values

n	a(n)
0	0
1	-1
2	1
3	0
4	4
5	3
6	9
7	8
8	16
9	15
10	25
11	24
12	36
13	35
14	49
15	48
16	64
17	63
18	81
19	80
20	100
21	99
22	121
23	120
24	144
25	143
26	169
27	168
28	196
29	195
30	225
31	224
32	256
33	255
34	289
35	288
36	324
37	323
38	361
39	360
40	400
41	399
42	441
43	440
44	484
45	483
46	529
47	528
48	576
49	575
50	625
51	624
52	676
53	675
54	729
55	728
56	784
57	783
58	841

n	a(n)
0	0
1	-1
2	1
3	0
4	4
5	3
6	9
7	8
8	16
9	15
10	25
11	24
12	36
13	35
14	49
15	48
16	64
17	63
18	81
19	80
20	100
21	99
22	121
23	120
24	144
25	143
26	169
27	168
28	196
29	195
30	225
31	224
32	256
33	255
34	289
35	288
36	324
37	323
38	361
39	360
40	400
41	399
42	441
43	440
44	484
45	483
46	529
47	528
48	576
49	575
50	625
51	624
52	676
53	675
54	729
55	728
56	784
57	783
58	841

n	a(n)
0	0
1	-1
2	1
3	0
4	4
5	3
6	9
7	8
8	16
9	15
10	25
11	24
12	36
13	35
14	49
15	48
16	64
17	63
18	81
19	80
20	100
21	99
22	121
23	120
24	144
25	143
26	169
27	168
28	196
29	195
30	225
31	224
32	256
33	255
34	289
35	288
36	324
37	323
38	361
39	360
40	400
41	399
42	441
43	440
44	484
45	483
46	529
47	528
48	576
49	575
50	625
51	624
52	676
53	675
54	729
55	728
56	784
57	783
58	841