A220712 - cp's OEIS frontend

A220712 Number of ways to reciprocally link elements of an 7Xn array either to themselves or to exactly two horizontal and antidiagonal neighbors, without consecutive collinear links.

n	a(n)
1	1
2	1
3	21
4	129
5	932
6	6412
7	44976
8	311193
9	2168111
10	15034974
11	104478616
12	725286308
13	5037269200
14	34977393156
15	242898931716
16	1686719471828
17	11713075485508
18	81338093590180
19	564832581201972
20	3922330554994484
21	27237632538545092

[1, 1, 21, 129, 932, 6412, 44976, 311193, 2168111, 15034974, 104478616, 725286308, 5037269200, 34977393156, 242898931716, 1686719471828, 11713075485508, 81338093590180, 564832581201972, 3922330554994484, 27237632538545092]

cp's OEIS Frontend

A220712 Number of ways to reciprocally link elements of an 7Xn array either to themselves or to exactly two horizontal and antidiagonal neighbors, without consecutive collinear links.

Table of values

List of values