61492

Appears in sequences

• a(0)=2, a(1)=3, a(n) = 3 + a(n-1) + a(n-2) for n >= 2.at n=20A171237
• Number of lattice paths from (0,0) to (n,n) using steps (1,0), (1,1), (0,2), (2,2).at n=9A191678