33488

Appears in sequences

• Expansion of e.g.f. sec(arcsin(x)*log(x+1)).at n=8A012314
• A generalized difference set on the set of all integers (lambda = 1).at n=24A024431
• "Fibonacci-digits": start with "11", append sum of first 2 digits to the preceding number, drop first digit.at n=15A093099
• a(n) = number of ways to dispose two pawns on a chessboard of size n X n (two dispositions are equivalent if one can be rotated or reflected to give the other one).at n=27A141582
• a(n) = 4*(3*n+1)*(3*n+2).at n=30A144410
• Nonsquarefree numbers such that n-1 is prime and n+1 is square.at n=40A146980
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 0), (-1, 1, -1), (0, 0, -1), (1, 0, 1)}.at n=11A148519
• a(n) = A165966(n)/12.at n=28A166119
• Number of nX6 0..1 arrays avoiding 0 0 0 and 0 0 1 horizontally and 0 1 0 and 1 1 1 vertically.at n=6A208499
• Number of 7 X n 0..1 arrays avoiding 0 0 0 and 0 0 1 horizontally and 0 1 0 and 1 1 1 vertically.at n=5A208505
• Number of length 1+3 0..n arrays with no disjoint pairs in any consecutive four terms having the same sum.at n=12A247727
• a(n) is the number of permutations of length n that avoid the pattern 321 and the mesh pattern (12, 187) or the same sequence for the mesh pattern (12, 442).at n=11A289592
• Numbers k such that one can make an equilateral triangle from a chain of linked rods of length 1, 2, 3, ..., k, with perimeter equal to the total length.at n=31A382632