27492

Appears in sequences

• Sum of n-th antidiagonal of array in A082002.at n=29A082005
• a(n) = (n^3 + 3*n - 2)/2.at n=37A132127
• Expansion of the g.f. (x^2-x+1)*(x^2-3*x+3)/(x-1)^6.at n=17A257890
• Ulam numbers k such that k/3 is also an Ulam number.at n=40A287212
• Number of solutions to +-1 +- 3 +- 5 +- 7 +- ... +- (4*n-1) = 0.at n=11A292476
• Number of compositions of n into parts with distinct multiplicities and with exactly nine parts.at n=24A321779
• Inverse permutation (conjectured) of A359356.at n=55A359517
• Number of solutions to +- 1 +- 3 +- 5 +- 7 +- ... +- (2*n-1) = 0 or 1.at n=22A367087
• a(n) = Sum_{k=0..n} (-1)^k * binomial(4*n-k+3,n-k).at n=5A390589