A005564 - cp's OEIS frontend

A005564 Number of n-step walks on square lattice in the first quadrant which finish at distance n-3 from the x-axis.

n	a(n)
3	6
4	20
5	45
6	84
7	140
8	216
9	315
10	440
11	594
12	780
13	1001
14	1260
15	1560
16	1904
17	2295
18	2736
19	3230
20	3780
21	4389
22	5060
23	5796
24	6600
25	7475
26	8424
27	9450
28	10556
29	11745
30	13020
31	14384
32	15840
33	17391
34	19040
35	20790
36	22644
37	24605
38	26676
39	28860
40	31160
41	33579
42	36120
43	38786
44	41580
45	44505

[6, 20, 45, 84, 140, 216, 315, 440, 594, 780, 1001, 1260, 1560, 1904, 2295, 2736, 3230, 3780, 4389, 5060, 5796, 6600, 7475, 8424, 9450, 10556, 11745, 13020, 14384, 15840, 17391, 19040, 20790, 22644, 24605, 26676, 28860, 31160, 33579, 36120, 38786, 41580, 44505]

cp's OEIS Frontend

A005564 Number of n-step walks on square lattice in the first quadrant which finish at distance n-3 from the x-axis.

Table of values

List of values