-648

Appears in sequences

• Expansion of Product_{k>=1} (1 - x^k)^12.at n=7A000735
• Expansion of (eta(q) * eta(q^9))^12 in powers of q.at n=7A034436
• Triangle a(n,k) (1<=k<=n) of "signed Eulerian numbers" read by rows.at n=58A049061
• Triangle: a(n,k) = A055135(n,k)/C(n,k).at n=49A055136
• McKay-Thompson series of class 20c for Monster.at n=67A058558
• Triangle of integers used to compute column sequences of array A078739 ((2,2)-Stirling2).at n=37A089511
• a(n) = -a(n-1) -a(n-2) -a(n-3) +a(n-4), a(0)=0, a(1)=1, a(2)=-1, a(3)=0.at n=30A100329
• Coordination sequence for octagonal tiling is a(n) + A103908(n)*sqrt(2).at n=9A103909
• Expansion of eta(q)^9 / eta(q^3)^3 in powers of q.at n=10A109041
• Expansion of eta(q)^9 / eta(q^3)^3 in powers of q.at n=30A109041
• Sequence is identical to its third differences in absolute value: a(0), a(1), a(2), a(2n+1)=3a(2n)-3a(2n-1)+2a(2n-2), a(2n+2)=3a(2n+1)-3a(2n), with a(0)=a(1)=0, a(2)=1.at n=19A131665
• Expansion of (phi(x) * psi(-x))^4 in powers of x where phi(), psi() are Ramanujan theta functions.at n=55A134461
• A Chebyshev polynomial triangle of the first kind defined by T(n+1,x) = 3x*T(n,x) - T(n-1,x).at n=17A136159
• Triangle T(n, k) = binomial(n, k) * Sum_{j=k..n} StirlingS1(n, j)*StirlingS1(j, k), read by rows.at n=43A142472
• Fibonacci matrix read by antidiagonals. (Inverse of A136158.)at n=22A164948
• Totally multiplicative sequence with a(p) = 9*(p-3) for prime p.at n=21A167319
• Expansion of b(q) * c(q^3)^2 / 9 in powers of q where b(), c() are cubic AGM theta functions.at n=43A181977
• Triangle T(n,k), n>=1, 0<=k<=n^2, read by rows: row n gives the coefficients of the chromatic polynomial of the square grid graph G_(n,n), highest powers first.at n=12A182368
• Central coefficients of number triangle A185962.at n=8A185965
• Coefficients of modular function denoted G_5(tau) by Atkin.at n=7A186210