19532

Appears in sequences

• Number of directed trees with n nodes.at n=7A006965
• Array A read by diagonals; n-th difference of (A(k,n), A(k,n-1),..., A(k,0)) is (k+2)^(n-1), for n=1,2,3,...; k=0,1,2,...at n=47A047848
• a(n) = (5^n + 3)/4.at n=7A047850
• Triangle whose k-th column satisfies a(n) = (k+3)*a(n-1)-(k+2)*a(n-2).at n=58A123490
• Dispersion of A016873, (5k+2), by antidiagonals.at n=28A191704
• Number of (w,x,y,z) with all terms in {0,...,n} and at least one of these conditions holds: w<R, x<R, y>R, z>R, where R = max{w,x,y,z} - min{w,x,y,z}.at n=11A212753
• Number of n X 4 0..1 arrays with every element equal to 1, 2, 3 or 5 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.at n=4A300608
• Number of nX5 0..1 arrays with every element equal to 1, 2, 3 or 5 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.at n=3A300609
• T(n,k)=Number of nXk 0..1 arrays with every element equal to 1, 2, 3 or 5 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.at n=31A300612
• T(n,k)=Number of nXk 0..1 arrays with every element equal to 1, 2, 3 or 5 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.at n=32A300612
• Numerator of (1+sigma(s)) / ((s+1)/2), where s is the square of n prime-shifted once (s = A003961(n)^2 = A003961(n^2)).at n=26A337338
• Number of cyclic subgroups of the group (C_n)^7, where C_n is the cyclic group of order n.at n=4A344303
• a(n) is the determinant of a symmetric Toeplitz matrix M(n) whose first row consists of prime(n), prime(n-1), ..., prime(1).at n=5A356492
• a(0) = 1; a(n) = (11*n^2 - 9*n + 4)/2 for n>0.at n=60A389625