A274890 - cp's OEIS frontend

A274890 Number of n X 3 0..2 arrays with no element equal to any value at offset (0,-1) (-1,-1) or (-2,0) and new values introduced in order 0..2.

n	a(n)
1	2
2	12
3	16
4	38
5	84
6	192
7	436
8	990
9	2253
10	5121
11	11645
12	26483
13	60215
14	136936
15	311381
16	708076
17	1610154
18	3661438
19	8326047
20	18933223
21	43053720
22	97903198
23	222629593
24	506254676
25	1151211539
26	2617828789
27	5952883022
28	13536720098
29	30782192928

[2, 12, 16, 38, 84, 192, 436, 990, 2253, 5121, 11645, 26483, 60215, 136936, 311381, 708076, 1610154, 3661438, 8326047, 18933223, 43053720, 97903198, 222629593, 506254676, 1151211539, 2617828789, 5952883022, 13536720098, 30782192928]

cp's OEIS Frontend

A274890 Number of n X 3 0..2 arrays with no element equal to any value at offset (0,-1) (-1,-1) or (-2,0) and new values introduced in order 0..2.

Table of values

List of values