39243888

Appears in sequences

• Number of (n+2) X (1+2) 0..1 arrays with each 3 X 3 subblock having clockwise perimeter pattern 00000001 00000011 or 00000111.at n=18A260063
• E.g.f.: Sum_{n>=0} 2^(n^2) * W(x)^(2^n) * x^n/n!, where W(x) = LambertW(-x)/(-x).at n=5A326086