74405

Appears in sequences

• Number of loopless rooted planar maps with 4 faces and n vertices and no isthmuses.at n=11A006417
• Strong pseudoprimes to base 96.at n=26A020322
• Strong pseudoprimes to base 99.at n=34A020325
• a(n) = number of (s(0), s(1), ..., s(n)) such that every s(i) is an integer, s(0) = 0, |s(i) - s(i-1)| = 1 for i = 1,2; |s(i) - s(i-1)| <= 1 for i >= 3, s(n) = 2. Also a(n) = T(n,n-2), where T is the array defined in A024996.at n=10A026069
• Number of nX2 1..3 arrays containing at least one of each value, all equal values connected, and rows considered as a single number in nondecreasing order.at n=23A166776
• Triangle T_4(n, m), the number of surjective multi-valued functions from {1, 1, 1, 1, 2, 3, ..., n-3} to {1, 2, 3, ..., m} by rows (n >= 1, 1 <= m <= n).at n=40A172108