128348domain: NAppears in sequencesNumbers k such that k^2+k+9 is a palindrome.at n=28A027726Expansion of x/(1 - x^2 - 2*x^5 - x^8 - x^10 - x^12).at n=39A143375Number of subsets of {1..n} containing n such that it is not possible to choose a different binary index of each element.at n=18A370589