21915550

Appears in sequences

• First numerator and then denominator of the central elements of the 1/4-Pascal triangle (by row).at n=28A046572
• First denominator and then numerator of the central elements of the 1/4-Pascal triangle (by row).at n=29A046573
• Distinct numbers in writing first numerator and then denominator of the central elements of the 1/4-Pascal triangle (by row).at n=15A046574
• Distinct even numbers in writing first numerator and then denominator of each element of the 1/4-Pascal triangle (by row).at n=34A046589