28156

Appears in sequences

• a(n) = a(1)*a(n-1) + a(2)*a(n-2) + ... + a(n-3)*a(3) for n >= 4, with initial terms 3, -2, 1, 3.at n=12A025261
• Number of (k,m,n)-multiantichains of multisets with k=3 and m=3.at n=4A084880
• a(n) = floor(n*(n^3-n-3)/(2*(n-1))).at n=36A117561
• Number of configurations in Conway's game of "Life" that fit into an n X n square and vanish in one step.at n=4A134963
• Numbers k which use half of the ten digits such that they have at least one factorization k=p*q that uses remaining half of the digits that are not in k.at n=12A195814
• Array: row n shows the coefficients of the characteristic polynomial of the n-th principal submatrix of the symmetric matrix A202873; by antidiagonals.at n=33A202767
• Numbers n = p * q, where n, p, and q together contain all 10 digits at least once.at n=18A253172
• Values n, where n = p * q, and n, p, and q together contain all 10 digits at least once, and no digit is in more than one of n, p or q.at n=12A253173
• Number of nontrivial prime powers p^k (k>1) less than 10^n.at n=10A267574
• Number of integer partitions of n whose semi-sums do not cover an interval of positive integers.at n=39A367403
• Numbers k which have a factorization k = f1*f2*...*fr where the digits of {k, f1, f2, ..., fr} together give 0,1,...,9 exactly once.at n=29A370970
• Numbers k which have a factorization k = f_1*f_2*...*f_r where f_i >= 1 and the digits of {k, f_1, f_2, ..., f_r} together give 0,1,...,9 exactly once.at n=45A372259