3487246domain: NAppears in sequencesGeneralized Euler numbers c(6,n).at n=3A000192Generalized class numbers c_(n,3).at n=5A000508Generalized Euler numbers.at n=6A001587Shanks's array c_{a,n} (a >= 1, n >= 0) that generalizes Euler and class numbers, read by antidiagonals upwards.at n=39A235605