21984

Appears in sequences

• a(n) = [ a(n-1)/(sqrt(6) - 2) ], where a(0) = 1.at n=13A024557
• Number of non-unimodal compositions of n into distinct terms.at n=28A072707
• Number of nondecreasing integer sequences of length 9 with sum zero and sum of absolute values 2n.at n=17A158143
• Number of nX2 1..4 arrays containing at least one of each value, all equal values connected, rows considered as a single number in nondecreasing order, and columns considered as a single number in increasing order.at n=9A166815
• Number of n X n symmetric binary matrices with each 1 adjacent to no more than 3 horizontally or vertically neighboring 1's.at n=4A191508
• Number of (n+1)X5 0..2 arrays with every 2X3 or 3X2 subblock having exactly two equal edges, and new values 0..2 introduced in row major order.at n=4A206211
• Number of (n+1) X 6 0..2 arrays with every 2 X 3 or 3 X 2 subblock having exactly two equal edges, and new values 0..2 introduced in row major order.at n=3A206212
• T(n,k)=Number of (n+1)X(k+1) 0..2 arrays with every 2X3 or 3X2 subblock having exactly two equal edges, and new values 0..2 introduced in row major order.at n=31A206215
• T(n,k)=Number of (n+1)X(k+1) 0..2 arrays with every 2X3 or 3X2 subblock having exactly two equal edges, and new values 0..2 introduced in row major order.at n=32A206215
• G.f. A(x) satisfies: x = A(x)-2*A(x)^2-2*A(x)^3.at n=6A276310
• Triangle read by rows: T(n,k) is the number of permutations of {1,...,n} whose longest embedded arithmetic progression has length k.at n=30A339941