31186

Appears in sequences

• a(n) is the concatenation of n and 6n.at n=30A009440
• a(n) = 1 + (number of partitions of n, n>0).at n=39A052810
• Diagonal in array of n-gonal numbers A081422.at n=30A081438
• a(n)=2*5^n-2^n.at n=6A083421
• Number of walks within N^2 (the first quadrant of Z^2) starting and ending at (0,0) and consisting of n steps taken from {(-1, 0), (-1, 1), (0, -1), (0, 1), (1, 0)}.at n=11A151363
• Count of propositional theorems up to 10^n in Richard C. Schroeppel's Goedelization of A101273.at n=8A166746
• Number of triangular n X n X n arrays colored with integers 0 upwards introduced in row major order, with no element equal to any neighbor, and containing the value n(n+1)/2-2.at n=21A211899
• Number of n X 2 -2..2 arrays of 2 X 2 subblock diagonal sums minus antidiagonal sums for some (n+1) X 3 binary array with rows and columns of the latter in lexicographically nondecreasing order.at n=10A227056
• Numbers n such that n*2^2203 - 1 is prime.at n=39A265503