72590

Appears in sequences

• Coefficient of x^4 in expansion of (1+x+x^2)^n.at n=33A005712
• Partial sums of A051865.at n=34A050441
• Convolution of Pell(n) and 2^n.at n=12A094706
• a(1) = a(2) = a(3) = 1; for n>2, a(n+1) = a(n) + a(n-1) + a(n-2) iff a(n) is prime, otherwise a(n+1) = a(n) + 1.at n=41A113058
• Triangle read by rows: matrix product of the binomial coefficients with the Stirling numbers of the second kind.at n=41A126350
• Triangle read by rows: A008277 * A007318.at n=39A137597
• Number of pairs of intersecting diagonals in the exterior of a regular n-gon.at n=31A211381
• Number of partitions of n such that (greatest part) - (least part) > number of parts.at n=48A237833
• a(n) = Trinomial(2*n+1, 4) = (1/6)*n*(2*n + 1)*(2*n^2 + 9*n + 1), n >= 0.at n=17A302709