27208

Appears in sequences

• Numbers k such that sopfr(k) = sopfr(k - sopfr(k)).at n=27A050781
• Expansion of (eta(q^4) * eta(q^12) / (eta(q) * eta(q^3)))^2 in powers of q.at n=19A123647
• First row of spectral array W(log(Pi)).at n=9A249329
• Number of n X 7 0..1 arrays with no element equal to more than one of its horizontal and vertical neighbors, with the exception of exactly one element, and with new values introduced in order 0 sequentially upwards.at n=13A280439
• Number of n X 4 0..1 arrays with each 1 horizontally or vertically adjacent to 2 or 3 1's.at n=6A295209
• Number of nX7 0..1 arrays with each 1 horizontally or vertically adjacent to 2 or 3 1s.at n=3A295212
• T(n,k)=Number of nXk 0..1 arrays with each 1 horizontally or vertically adjacent to 2 or 3 1s.at n=48A295213
• T(n,k)=Number of nXk 0..1 arrays with each 1 horizontally or vertically adjacent to 2 or 3 1s.at n=51A295213
• Expansion of Product_{i>=1, j>=1} (1 + x^(i*j) + x^(2*i*j)).at n=24A329805
• T(n,k) is the number of permutations of [n] having exactly k pairs of integers i<j in [n] such that their cycle minima have opposite sorting order; triangle T(n,k), n>=0, 0<=k<=A125811(n)-1, read by rows.at n=51A381529