22940

Appears in sequences

• Heptagonal (or 7-gonal) pyramidal numbers: a(n) = n*(n+1)*(5*n-2)/6.at n=30A002413
• Largest possible z-value of an integer solution (x,y,z) to 4/n = 1/x + 1/y + 1/z satisfying 0 < x < y < z. The x and y components are in A075245 and A075246.at n=34A075247
• a(n) = p(n)*p(n+2) - 3*p(n+1), where p(n) is the n-th prime.at n=34A152528
• Number of n X 4 binary arrays without the pattern 0 1 diagonally or vertically.at n=21A188838
• Number of labeled graphs on [n] with unicyclic components containing a given edge.at n=4A210507
• Even heptagonal pyramidal numbers.at n=21A218325
• z-value of the lexicographically first solution (x,y,z) of 4/n = 1/x + 1/y + 1/z with 0 < x < y < z all integers, or 0 if there is no such solution. Corresponding x and y values are in A257839 and A257840.at n=36A257841
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 342", based on the 5-celled von Neumann neighborhood.at n=39A269511
• a(n) = Sum_{k=0..7} (n + k)^2.at n=50A276026
• Numbers k such that k!6 + 27 is prime, where k!6 is the sextuple factorial number (A085158 ).at n=26A288447
• a(n) = [x^n] Product_{d|n} (1 + x^d)/(1 - x^d).at n=40A300549
• Number of minimal total dominating sets in the n-triangular honeycomb obtuse knight graph.at n=7A304559
• G.f.: Sum_{n>=0} (n+1)*(n+2)*(n+3)/3! * x^n * (1 + x^n)^n.at n=49A326004
• Number of widely totally normal compositions of n.at n=19A332279
• Expansion of e.g.f. exp(exp(-x) - 1)/(1 - x).at n=8A367971