1179657domain: NAppears in sequencesNumber of length n+3 0..2 arrays with some disjoint pairs in every consecutive four terms having the same sum.at n=31A247527Numbers n not divisible by 2 such that n^2 written in base 4 has no digit > 1.at n=20A257284a(n) = 36*2^n + 9.at n=15A305154