1469650

Appears in sequences

• First numerator and then denominator of the central elements of the 1/4-Pascal triangle (by row).at n=24A046572
• First denominator and then numerator of the central elements of the 1/4-Pascal triangle (by row).at n=25A046573
• Distinct numbers in writing first numerator and then denominator of the central elements of the 1/4-Pascal triangle (by row).at n=13A046574
• Distinct even numbers in writing first numerator and then denominator of each element of the 1/4-Pascal triangle (by row).at n=26A046589
• a(n) = Sum_{i=0..floor(n/2)} T(i,n-i), array T as in A047072.at n=24A047074
• a(n) = (8*n+9)*C(n+8,8)/9.at n=12A056122
• Triangle read by rows: T(n,r) = binomial(n,r)*binomial(2*n-3*r-4,n-2*r-2)/(n-r-1), n >= 2, r = 0..floor(n/2)-1.at n=51A259097