50816737

Appears in sequences

• a(n) = 2*a(n-1) + a(n-4).at n=24A008999
• Expansion of (1-x^2)/(1 -4*x -2*x^2 +x^4).at n=12A117439
• The Gi3 sums of the Pell-Jacobsthal triangle A013609.at n=9A180676