A222993 - cp's OEIS frontend

A222993 Number of n X 2 0..2 arrays with successive rows and columns fitting to straight lines with nondecreasing slope, with a single point array taken as having zero slope.

n	a(n)
1	9
2	50
3	222
4	867
5	3123
6	10660
7	35064
8	112373
9	353517
10	1097430
11	3374226
12	10302919
13	31301991
14	94757960
15	286108908
16	862258905
17	2595165345
18	7803321850
19	23447714310
20	70422834731
21	211436276379
22	634661150700
23	1904721649632
24	5715708452797

[9, 50, 222, 867, 3123, 10660, 35064, 112373, 353517, 1097430, 3374226, 10302919, 31301991, 94757960, 286108908, 862258905, 2595165345, 7803321850, 23447714310, 70422834731, 211436276379, 634661150700, 1904721649632, 5715708452797]

cp's OEIS Frontend

A222993 Number of n X 2 0..2 arrays with successive rows and columns fitting to straight lines with nondecreasing slope, with a single point array taken as having zero slope.

Table of values

List of values