A006451
A098586
A124124
A098790
oeis.org
4 interlaced bisections from
189
32
5
0
1
6
37
218
…
78
13
2
2
15
90
…
a(n) = (1/2) * (5 P(n+1) + P(n) - 1),
where P(k) are the Pell numbers
A000129
Nonnegative integers n such that
2n^2 + 2n - 3 is square.
Numbers n such that
n*(n+1)/2+1 is a square.
a(n) = 2*a(n-1) + a(n-2) + 1,
a(0) = 1, a(1) = 2.