A105051 - cp's OEIS frontend

A105051 Define a(1)=0, a(2)=0, a(3)=15, a(4)=111 then a(n) = 254a(n-2) - a(n-4) + 126 also sequence such that 7a(n)*(a(n) + 1) + 1 = a square.

n	a(n)
1	0
2	0
3	15
4	111
5	3936
6	28320
7	999855
8	7193295
9	253959360
10	1827068736
11	64504677711
12	464068265775
13	16383934179360
14	117871512438240
15	4161454776879855
16	29938900091047311
17	1056993129393303936
18	7604362751613578880

[0, 0, 15, 111, 3936, 28320, 999855, 7193295, 253959360, 1827068736, 64504677711, 464068265775, 16383934179360, 117871512438240, 4161454776879855, 29938900091047311, 1056993129393303936, 7604362751613578880]

cp's OEIS Frontend

A105051 Define a(1)=0, a(2)=0, a(3)=15, a(4)=111 then a(n) = 254a(n-2) - a(n-4) + 126 also sequence such that 7a(n)*(a(n) + 1) + 1 = a square.

Table of values

List of values

cp's OEIS Frontend

A105051 Define a(1)=0, a(2)=0, a(3)=15, a(4)=111 then a(n) = 254*a(n-2) - a(n-4) + 126 also sequence such that 7*a(n)*(a(n) + 1) + 1 = a square.

Table of values

List of values

A105051 Define a(1)=0, a(2)=0, a(3)=15, a(4)=111 then a(n) = 254a(n-2) - a(n-4) + 126 also sequence such that 7a(n)*(a(n) + 1) + 1 = a square.