63726

Appears in sequences

• a(n) = S2(n,1), where S2(n, t) = Sum_{k=0..n} k^t *(Sum_{j=0..k} binomial(n,j))^2.at n=6A089664
• Euler-Seidel matrix T(k,n) with start sequence A000248, read by antidiagonals.at n=41A098697
• Let P be a one-move "rider" with move set M={(1,2)}; a(n) is the number of non-attacking positions of two indistinguishable pieces P on an n X n board.at n=18A222308
• Number of length 2+4 0..n arrays with every five consecutive terms having four times some element equal to the sum of the remaining four.at n=12A249658