274878431232
domain: N
Appears in sequences
- Number of types of Boolean functions of n variables under a certain group.at n=18A028402
- a(-1) = 1; for n >= 0, a(n) = 2^n + 4^n = 2^n*(1 + 2^n).at n=20A063376
- a(n) = Sum_{k=0..n} binomial(4*n,4*k).at n=10A070775
- Number of words of length 2n in the two letters s and t that reduce to the identity 1 by using the relations ssTT=1, ststSS=1 and ststTT=1, where S and T are the inverses of s and t, respectively (i.e., sS=1 and tT=1). The generators s and t and the three stated relations generate the quaternion group Q4.at n=19A071930
- (4^n+2^n+0^n+(-2)^n)/4.at n=20A083885
- a(n) = 2^n + 4^n.at n=19A161168
- Table read by antidiagonals: T(n,k) is the number of tilings of the n X k grid up to horizontal and vertical reflections by an asymmetric tile.at n=31A368220
- Table read by antidiagonals: T(n,k) is the number of tilings of the n X k grid up to horizontal and vertical reflections by an asymmetric tile.at n=32A368220
- Cogrowth sequence for the 8-element group C4 X C2 = <S,T | S^4, T^2, [S,T]>.at n=20A377714
- a(n) = Sum_{k=0..n} binomial(3*n+1,4*k).at n=13A387870