A352838 - cp's OEIS frontend

A352838 Irregular triangle read by rows: T(n, k) is the number of 2n-step closed walks on the square lattice having algebraic area k; n >= 0, 0 <= k <= floor(n^2/4).

n	a(n)
0	1
1	4
2	28
3	4
4	232
5	72
6	12
7	2156
8	1008
9	308
10	48
11	8
12	21944
13	13160
14	5540
15	1560
16	420
17	80
18	20
19	240280
20	168780
21	87192
22	33628
23	11964
24	3636
25	1200
26	264
27	72
28	12
29	2787320
30	2168544
31	1291220
32	610232
33	262612
34	101976
35	40376
36	13720
37	4900
38	1512
39	420
40	112
41	28

[1, 4, 28, 4, 232, 72, 12, 2156, 1008, 308, 48, 8, 21944, 13160, 5540, 1560, 420, 80, 20, 240280, 168780, 87192, 33628, 11964, 3636, 1200, 264, 72, 12, 2787320, 2168544, 1291220, 610232, 262612, 101976, 40376, 13720, 4900, 1512, 420, 112, 28]

cp's OEIS Frontend

A352838 Irregular triangle read by rows: T(n, k) is the number of 2n-step closed walks on the square lattice having algebraic area k; n >= 0, 0 <= k <= floor(n^2/4).

Table of values

List of values