18466

Appears in sequences

• Cycle class sequence c(n) (the number of true cycles of length n in which a certain node is included) for zeolite HEU = Heulandite Ca4[Al8Si28O72].24H2O starting with a T1 atom.at n=13A019138
• Numbers whose base-4 representation contains exactly four 0's and three 2's.at n=26A045060
• Numbers n such that if p=prime(n), then p, p+6, p+12, p+18 are consecutive primes with p=6*k+5 for some k, where prime(n) denotes n-th prime.at n=30A090835
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, 0, 0), (0, -1, 1), (1, 1, -1), (1, 1, 0), (1, 1, 1)}.at n=7A150998
• G.f.: Product_{n>=1} (1 + x^n + x^(n+1)).at n=38A160571
• Number of (w,x,y,z) with all terms in {1,...,n} and w<|x-y|+|y-z|.at n=28A212692
• The Wiener index of the straight pentachain of n pentagonal rings (see Fig. 2.1 in the A. A. Ali et al. reference).at n=19A224459
• Number of (n+4) X 9 0..1 matrices with each 5 X 5 subblock idempotent.at n=13A224687
• Number of partitions of n for which 2*(number of distinct parts) > (number of parts).at n=42A237365
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 267", based on the 5-celled von Neumann neighborhood.at n=30A271085
• Number of nX5 0..1 arrays with every element equal to 0, 1, 3 or 4 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.at n=9A300503
• Expansion of Product_{j>=1} (1 + (-1 + Product_{k>=1} (1 + x^k)^k)^j)^j.at n=8A307323
• The sum of the numbers that are inside the contour of an n-story Christmas tree drawn at the top of the numerical pyramid containing the positive integers in natural order.at n=7A358994