27978

Appears in sequences

• a(n) is the solution to the postage stamp problem with 4 denominations and n stamps.at n=37A001209
• Number of permutations of length n by rises.at n=3A001282
• Irregular triangle read by rows: T(n,k) (n >= 1, 0 <= k <= [n/2]) = number of permutations of 1..n with [n/2]-k runs of consecutive pairs up and down (divided by 2).at n=25A010030
• McKay-Thompson series of class 18g for the Monster group.at n=64A112156
• Number of 4Xn 0..1 arrays avoiding 0 0 0 and 0 1 1 horizontally and 0 0 0 and 1 1 1 vertically.at n=7A207348
• Expansion of psi(x^4) / f(-x) in powers of x where psi(), f() are Ramanujan theta functions.at n=36A226635
• Number of non-isomorphic multiset partitions of weight n with no constant parts and only two distinct vertices.at n=25A323654
• G.f.: A(x,y) = Sum_{n>=0} x^n * ((1+x)^n + y)^n, where A(0) = 0, as a triangle of coefficients T(n,k) of x^n*y^k in A(x,y) = Sum_{n>=0} x^n * Sum_{k=0..n} T(n,k)*x^n*y^k, read by rows.at n=60A325580
• Lesser of 2 successive sphenic numbers (k, k+4) sandwiching 3 consecutive nonsquarefree numbers.at n=37A363830