18882

Appears in sequences

• Number of squarefree palindromes over {0, 1, 2} of length 2n+1.at n=34A012212
• Apply partial sum operator thrice to Stern's sequence.at n=13A014173
• Closed 3-dimensional ball numbers (version 2): a(n)= number of integer points (i,j,k) contained in a closed ball of diameter n, centered at (1/2,0,0).at n=33A053593
• Row sums of A095167.at n=32A095170
• Number of possible Fischer Random Chess games at the end of the n-th ply.at n=1A157851
• Indices of pentagonal pyramidal numbers which are the sum of two other such numbers: k such that A002411(k) = A002411(i)+A002411(j) for some i,j>0.at n=34A172437
• Number of nX3 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 4,3,0,2,2 for x=0,1,2,3,4.at n=7A197556
• T(n,k)=Number of nXk 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 4,3,0,2,2 for x=0,1,2,3,4.at n=47A197561
• T(n,k)=Number of nXk 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 4,3,0,2,2 for x=0,1,2,3,4.at n=52A197561
• Smallest sets of 7 consecutive abundant numbers in arithmetic progression. The initial abundant number is listed.at n=8A228964
• Numbers n such that both n*log(2) and n*log(3) are within 1/sqrt(n) of integers.at n=36A259483
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 553", based on the 5-celled von Neumann neighborhood.at n=26A272848
• Expansion of Product_{n>=1} (1 - x^(3*n))/(1 - x^n)^2 in powers of x.at n=21A278690
• Irregular table read by rows: Take a nonagon with all diagonals drawn, as in A332421. Then T(n,k) = number of k-sided polygons in that figure for k >= 3.at n=20A332427
• a(0) = 1; a(n) = (11*n^2 - 9*n + 4)/2 for n>0.at n=59A389625