27798

Appears in sequences

• Number of permutations of length n which avoid the patterns 1234, 3421, 4312.at n=36A116756
• Triangle read by rows: row n gives coefficients of expansion of q-tangent number T_{2n+1}(q) in powers of q.at n=45A143194
• Triangle read by rows: row n gives coefficients of expansion of q-tangent number T_{2n+1}(q) in powers of q.at n=50A143194
• a(n) = 121*n^2 - 204*n + 86.at n=15A157440
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 169", based on the 5-celled von Neumann neighborhood.at n=35A270463
• Hyper-Wiener index of body-centered cubic grid cells in a row.at n=7A302351
• Number of set partitions of [n] such that for each block b the smallest integer interval containing b has at most three elements and for at least one block c the smallest integer interval containing c has exactly three elements.at n=12A320553
• Sum of all the parts in the partitions of n into 8 squarefree parts.at n=41A326444
• a(1) = 1; for n > 1, a(n) = n*a(n-1) if n is a prime, otherwise a(n) = floor(a(n-1)/A020639(n)), where A020639(n) is the smallest prime divisor of n.at n=40A330252