18210

Appears in sequences

• Cycle class sequence c(n) (the number of true cycles of length n in which a certain node is included) for zeolite CON = CIT-1 H2[B2Si54O112] starting with a T1 atom.at n=13A019098
• Numbers k such that 217*2^k+1 is prime.at n=7A032485
• a(n) = 81n^2 - n.at n=14A157953
• a(n) = 225*n^2 - 15.at n=8A158559
• a(n) = (5*2^n - 5*(-1)^n - 3*n*(-1)^n) / 9.at n=15A172285
• Number of (n+1) X 5 0..3 arrays with every 2 X 2 subblock having nonzero determinant and commuting with every horizontal or vertical neighbor.at n=8A206339
• Number of length 4 1..(n+2) arrays with no leading partial sum equal to a prime.at n=14A254542
• Number of (n+2)X(1+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000011 or 00010101.at n=9A260834
• T(n,k)=Number of (n+2)X(k+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000011 or 00010101.at n=45A260841
• Number of nX7 binary arrays with some element plus some horizontally, diagonally or antidiagonally adjacent neighbor totalling two exactly once.at n=2A269010
• T(n,k)=Number of nXk binary arrays with some element plus some horizontally, diagonally or antidiagonally adjacent neighbor totalling two exactly once.at n=38A269011
• Number of 3 X n binary arrays with some element plus some horizontally, diagonally or antidiagonally adjacent neighbor totalling two exactly once.at n=6A269013
• Positive even numbers which are neither of the form p + 2^m + 1 nor of the form p + 2^m - 1 with p prime.at n=26A270446
• Number of power towers of x whose integrals over [0, 1] are above average.at n=13A306563
• Number of n-step self-avoiding walks on the hypertriangular lattice with no non-contiguous adjacencies.at n=7A344039
• Number of compositions (ordered partitions) of n into at most 5 nonprime parts.at n=50A347798
• Number of iterations before a repeated value, or -1 if this never occurs, when starting at k = 1 and repeating k = k*n if k does not contain any adjacent equal digits, else k = k with all adjacent equal digits replaced by a single copy of the same digit.at n=15A368940
• Expansion of g.f. A(x) satisfying A(x)^2 = A( x^2/(1-2*x)^3 )/(1-2*x).at n=9A375443