481461

Appears in sequences

• Number of permutations of length n which avoid the patterns 1234, 1342, 4132.at n=12A116827
• a(n) = a(n-1) + 3*a(n-2) -2*a(n-3) - 2*a(n-4), where a(0) = 0, a(1) = 0, a(2) = -1, a(3) = 1.at n=30A295725