9994240

Appears in sequences

• a(n) = 2*a(n-1) + 4*a(n-2), a(0)=1, a(1)=2.at n=14A063727
• Horadam sequence (0,1,4,2).at n=15A085449
• a(n) = Sum_{k=0..n} binomial(2n+1, 2k)*5^(n-k).at n=7A102592
• a(1) = 1, a(n) = 2*a(n-1) if n is even; a(n) = a(n-1)*Fibonacci((n+1)/2)/Fibonacci((n-1)/2) if n is odd.at n=28A171648
• Number of (n+1) X (n+1) 0..1 arrays with the number of rightwards and downwards edge increases in each 2 X 2 subblock differing from the number in all its horizontal and vertical neighbors.at n=16A205064
• Number of (4+2) X (n+2) 0..3 arrays with every 3 X 3 subblock row and diagonal sum equal to 0 2 3 6 or 7 and every 3 X 3 column and antidiagonal sum not equal to 0 2 3 6 or 7.at n=23A252536
• Number of subsets of {1, 2, 3, ..., n} that include no consecutive even integers.at n=27A279312