42704

Appears in sequences

• The trinomial transform (A027907) gives powers of 2, while the trinomial transform of this sequence shift one place left gives powers of 3.at n=17A100321
• Expansion of -x*(47*x^3+25*x^2+5*x+1)/(38*x^4+54*x^3+22*x^2-1).at n=6A122501
• Number of binary strings of length n containing the substring 11011.at n=17A276785
• Number of compositions of n whose run-lengths are either strictly increasing or strictly decreasing.at n=46A333191
• Numbers k such that one can make an equilateral triangle from a chain of linked rods of length 1, 2, 3, ..., k, with perimeter equal to the total length.at n=36A382632