87893

Appears in sequences

• a(0) = 1; for n >= 1, a(n) = 4*a(n-1) - (2^n - 1).at n=9A079319
• Triangle read by rows in which T(n,k) is the number of permutations avoiding 132 of length n with an independent set of size k in its coregraph.at n=53A262370