A220564 - cp's OEIS frontend

A220564 Number of ways to reciprocally link elements of an 3 X n array either to themselves or to exactly one horizontal or antidiagonal neighbor.

n	a(n)
1	1
2	13
3	64
4	430
5	2604
6	16310
7	101052
8	628269
9	3901815
10	24240377
11	150578968
12	935414825
13	5810847665
14	36097422853
15	224239670624
16	1392992694942
17	8653368270212
18	53755331997318
19	333931897912068
20	2074408410086741

[1, 13, 64, 430, 2604, 16310, 101052, 628269, 3901815, 24240377, 150578968, 935414825, 5810847665, 36097422853, 224239670624, 1392992694942, 8653368270212, 53755331997318, 333931897912068, 2074408410086741]

cp's OEIS Frontend

A220564 Number of ways to reciprocally link elements of an 3 X n array either to themselves or to exactly one horizontal or antidiagonal neighbor.

Table of values

List of values