44736512

Appears in sequences

• Number of alternating permutations of order n.at n=13A001250
• a(n) = 2^(n-1)*(2^n - (-1)^n)/3.at n=14A003683
• Number of Barlow packings with group P3(bar)m1(S) that repeat after 2n layers.at n=28A011951
• Number of Barlow packings with group R3(bar)m(O) that repeat after 6n layers.at n=25A011955
• E.g.f.: -log(cos(x)*cos(x)) (even powers only).at n=7A012509
• Expansion of sec(x)^2+sech(x)^2 in powers of x^4.at n=3A012853
• Admirable numbers that set a new record for largest subtracted divisor.at n=12A109745
• Starting a priori with the fraction 1/1, the denominators of fractions built according to the rule: add top and bottom to get the new bottom, add top and 9 times the bottom to get the new top.at n=12A110953
• Triangle read by rows, whose row sums using Euler numbers are the unsigned even-indexed Bernoulli numbers (denominators).at n=23A229097
• Triangle read by rows, whose row sums using Euler numbers are the unsigned even-indexed Bernoulli numbers (denominators).at n=25A229097
• Number of arrays of length n that are sums of 2 consecutive elements of length n+1 permutations of 0..n, and no two consecutive rises or falls in the latter permutation.at n=11A229712
• Twice the Euler or up/down numbers A000111.at n=13A260786
• Decimal representation of the diagonal from the origin to the corner of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 342", based on the 5-celled von Neumann neighborhood.at n=25A287745
• Decimal representation of the diagonal from the origin to the corner of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 342", based on the 5-celled von Neumann neighborhood.at n=26A287745
• Expansion of e.g.f.: sec(x) + 2*tan(x).at n=13A309845
• a(n) = (4^n - 2^n) / Clausen(n, 1).at n=14A363403