120835

Appears in sequences

• a(n) = ((2*n-1)!/(2*n!*(n-2)!))*((n^3-3*n^2+2*n+2)/(n^2-1)).at n=6A002739
• T(2n-1,n), where T is the array defined in A025564.at n=7A025569
• a(n) = T(n,[ n/2 ]+1), where T is the array defined in A025564.at n=13A025576
• Odd numbers divisible by the palindromic sum of their prime factors (counted with multiplicity).at n=23A046359
• Number of n X 2 nonnegative integer arrays with upper left 0 and lower right n+2-6 and value increasing by 0 or 1 with every step right or down.at n=13A252924
• Triangle T(n,k) (n >= k >= 0) read by rows: T(n,0) = (1+(-1)^n)/2; for k>=1, set T(0,k) = 0, S(n,k) = binomial(n,k)*binomial(n+k+1,k), and for n>=1, T(n,k) = S(n,k)-T(n-1,k).at n=42A331432