26826

Appears in sequences

• Number of n-step self-avoiding walks on hexagonal lattice from (0,0) to (0,3).at n=7A005549
• McKay-Thompson series of class 27b for the Monster group.at n=34A058601
• Numbers k such that sopf(k) = sopf(k+3), where sopf(k) = A008472(k).at n=27A063969
• a(3) = 2, a(4) = 3; for n > 4, a(n) = {a(n-2)}+{a(n-1)}, where {a} means largest prime <= a.at n=21A065435
• Row sums of triangle A084408.at n=38A084411
• The sum of the principal diagonals of an n X n spiral.at n=34A137930
• Sum of the principal diagonals of a 2n X 2n square spiral.at n=17A137931
• Number of binary strings of length n with equal numbers of 0001 and 1100 substrings.at n=16A164164
• Number of arrays of median of three adjacent elements of some length-5 0..n array, with no adjacent equal elements in the latter.at n=28A229013
• Number of partitions of n with difference 3 between the number of odd parts and the number of even parts, both counted without multiplicity.at n=44A242694
• G.f.: 1 = Sum_{n>=0} a(n)*x^n * [ Sum_{k=0..n+1} binomial(n+1, k)^2*(-x)^k ]^3.at n=4A247030
• Number of 3Xn arrays containing n copies of 0..3-1 with row sums equal, column sums equal and full-length antidiagonal sums equal to the short dimension sums.at n=16A265118
• Number of tilings of a 5 X n rectangle using n pentominoes of shapes P, X, Y.at n=11A343529
• Number of compositions (ordered partitions) of n into Pell numbers (A000129).at n=20A355805