24778

Appears in sequences

• a(n) = 1 + (26*n+17+7*n^2)*n/2.at n=18A095796
• Number of compositions of n where differences between neighboring parts are in {-2,0,2}.at n=27A214253
• G.f.: Sum_{n=-oo..+oo} x^n * (1 + x^n)^n, an even function.at n=57A260361
• a(n) = (n + 1)*(4*n^2 + 14*n + 9)/3.at n=25A268484
• Number of subsets of {1..n} containing n such that every subset has a different sum.at n=33A325866
• Zeroless analog of tetranacci numbers.at n=20A371916