71722

Appears in sequences

• If p(k) is the k-th prime, then the n-th set of 4 consecutive cousin prime pairs starts at p(a(n)).at n=10A095971
• Partial sums of tetranacci numbers (A000288).at n=18A189740
• a(n) = Sum{0<=k<=n} binomial(n+k,n-k) * k! / (floor(k/2)!)^2.at n=9A190910
• Number of (n+2)X(4+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 or 00000011.at n=9A259719
• Number of nX4 0..1 arrays with each 1 horizontally, vertically or antidiagonally adjacent to 2 or 4 neighboring 1s.at n=8A296537
• Number of 4-shaft weaving patterns, threaded 1,2,3,4, with n rows, up to symmetries.at n=5A359972