A110127 - cp's OEIS frontend

A110127 Number of EE's crossing the line y = x (i.e., two consecutive E steps from the line y = x+1 to the line y = x-1) in all Delannoy paths of length n.

n	a(n)
0	0
1	0
2	1
3	10
4	75
5	508
6	3277
7	20566
8	126871
9	773688
10	4679769
11	28136546
12	168395235
13	1004239156
14	5971820709
15	35429993390
16	209800355631
17	1240361694064
18	7323260678065
19	43187703202234
20	254439363998587
21	1497730375793004

[0, 0, 1, 10, 75, 508, 3277, 20566, 126871, 773688, 4679769, 28136546, 168395235, 1004239156, 5971820709, 35429993390, 209800355631, 1240361694064, 7323260678065, 43187703202234, 254439363998587, 1497730375793004]

cp's OEIS Frontend

A110127 Number of EE's crossing the line y = x (i.e., two consecutive E steps from the line y = x+1 to the line y = x-1) in all Delannoy paths of length n.

Table of values

List of values