123712

Appears in sequences

• Expansion of (1-x^2)/(1-x-x^2+x^3+x^4).at n=44A101496
• Expansion of (1-2*x+2*x^2-x^3)/(1-3*x+5*x^2-3*x^3+x^4).at n=22A123879
• G.f.: 1/(1-2*x+2*x^2-x^3+x^4).at n=42A199802
• Trisection 0 of A199802.at n=14A199927
• Infinite sum of the natural numbers, compacted (see comments for an explanation).at n=20A336897