A212040 - cp's OEIS frontend

A212040 Number of lower triangular n X n arrays colored with integers 0 upwards introduced in row major order, with no element equal to any element within a city block distance of two, and containing the value n(n+1)/2-3.

n	a(n)
1	0
2	1
3	5
4	119
5	1310
6	7849
7	32696
8	107400
9	298404
10	731960
11	1630174
12	3361016
13	6505445
14	11945114
15	20974435
16	35441099
17	57919461
18	91921515
19	142150499
20	214802485
21	317921624
22	461815031

[0, 1, 5, 119, 1310, 7849, 32696, 107400, 298404, 731960, 1630174, 3361016, 6505445, 11945114, 20974435, 35441099, 57919461, 91921515, 142150499, 214802485, 317921624, 461815031]

cp's OEIS Frontend

A212040 Number of lower triangular n X n arrays colored with integers 0 upwards introduced in row major order, with no element equal to any element within a city block distance of two, and containing the value n(n+1)/2-3.

Table of values

List of values