A103737 - cp's OEIS frontend

A103737 Define a(1)=0, a(2)=0, a(3)=3, a(4)=7 such that from i=1 to 4: 30a(i)^2 + 30a(i) + 1 = j(i)^2, j(1)=1, j(2)=1, j(3)=19, j(4)=41 Then a(n) = a(n-4) + 4sqrt(30(a(n-2)^2) + 30*a(n-2) + 1).

n	a(n)
1	0
2	0
3	3
4	7
5	76
6	164
7	1679
8	3611
9	36872
10	79288
11	809515
12	1740735
13	17772468
14	38216892
15	390184791
16	839030899
17	8566292944
18	18420462896
19	188068259987
20	404411152823
21	4128935426780
22	8878624899220
23	90648511129183
24	194925336630027
25	1990138309415256
26	4279478780961384
27	43692394296006459

[0, 0, 3, 7, 76, 164, 1679, 3611, 36872, 79288, 809515, 1740735, 17772468, 38216892, 390184791, 839030899, 8566292944, 18420462896, 188068259987, 404411152823, 4128935426780, 8878624899220, 90648511129183, 194925336630027, 1990138309415256, 4279478780961384, 43692394296006459]

cp's OEIS Frontend

A103737 Define a(1)=0, a(2)=0, a(3)=3, a(4)=7 such that from i=1 to 4: 30a(i)^2 + 30a(i) + 1 = j(i)^2, j(1)=1, j(2)=1, j(3)=19, j(4)=41 Then a(n) = a(n-4) + 4sqrt(30(a(n-2)^2) + 30*a(n-2) + 1).

Table of values

List of values

cp's OEIS Frontend

A103737 Define a(1)=0, a(2)=0, a(3)=3, a(4)=7 such that from i=1 to 4: 30*a(i)^2 + 30*a(i) + 1 = j(i)^2, j(1)=1, j(2)=1, j(3)=19, j(4)=41 Then a(n) = a(n-4) + 4*sqrt(30*(a(n-2)^2) + 30*a(n-2) + 1).

Table of values

List of values

A103737 Define a(1)=0, a(2)=0, a(3)=3, a(4)=7 such that from i=1 to 4: 30a(i)^2 + 30a(i) + 1 = j(i)^2, j(1)=1, j(2)=1, j(3)=19, j(4)=41 Then a(n) = a(n-4) + 4sqrt(30(a(n-2)^2) + 30*a(n-2) + 1).