231837

Appears in sequences

• a(n) = 2*a(n-1) - a(n-3) for n >= 5, a(0) = 2, a(1) = 4, a(2) = 7, a(3) = 12, a(4) = 22.at n=23A289107
• Coefficient of x^n in the expansion of ( (1+x) / (1-x^3)^2 )^n.at n=11A370214