A199242 - cp's OEIS frontend

A199242 Number of nX4 0..2 arrays with values 0..2 introduced in row major order, the number of instances of each value within one of each other, and every element equal to zero or two horizontal or vertical neighbors.

n	a(n)
1	3
2	12
3	25
4	440
5	2907
6	7100
7	134821
8	934004
9	2277108
10	46296108
11	330908530
12	820702285
13	17258404593
14	125752465794
15	315014793177
16	6765057712760
17	49918706666467
18	125910537922412
19	2743415189299833
20	20425391744058298

[3, 12, 25, 440, 2907, 7100, 134821, 934004, 2277108, 46296108, 330908530, 820702285, 17258404593, 125752465794, 315014793177, 6765057712760, 49918706666467, 125910537922412, 2743415189299833, 20425391744058298]

cp's OEIS Frontend

A199242 Number of nX4 0..2 arrays with values 0..2 introduced in row major order, the number of instances of each value within one of each other, and every element equal to zero or two horizontal or vertical neighbors.

Table of values

List of values