66013

Appears in sequences

• a(n) is the sum of the (1,2)- and (1,3)-entries of the matrix P^n + T^n, where the 3 X 3 matrices P and T are defined by P = [0,1,0; 0,0,1; 1,0,0] and T = [0,1,0; 0,0,1; 1,1,1].at n=20A109523
• Column 1 of triangle A128564; a(n) equals the number of permutations of {1..n+2} with [n/2+1] inversions for n>=0.at n=13A128565
• Number of reduced words of length n in the Weyl group A_14.at n=7A161475
• Number of binary strings of length n with no substrings equal to 0001 or 1000.at n=14A164398
• Sum of all parts that are not the smallest part (counted with multiplicity) of all partitions of n.at n=26A213359
• Number of (n+3) X 10 0..1 matrices with each 4 X 4 subblock idempotent.at n=18A224567
• Mahonian numbers T(n,7) (cf. A008302).at n=10A242657
• Sequence of pairwise relatively prime numbers of class P_4 (see comment in A275246).at n=27A275248
• a(0) = 0, and for n > 0, (a(n)) gives the indices n for which d(n) < d(k) for k < n, where d is the difference sequence of (cos k + sin k).at n=26A299640
• Partial sums of A033616.at n=51A299902
• Number of nX5 0..1 arrays with every element equal to 0 or 1 horizontally or antidiagonally adjacent elements, with upper left element zero.at n=15A301787
• Nonprime squarefree numbers whose prime indices all have the same Omega (A001222) and the same sum of prime indices (A056239).at n=30A327908
• Number of solutions winning the Tchoukaillon game with n seeds and 2n pits.at n=7A382454