134416domain: NAppears in sequencesNumber of n X 5 binary arrays without the pattern 0 1 diagonally or vertically.at n=20A188839E.g.f.: Sum_{n>=0} Product_{k=1..n} tan((2*k-1)*x).at n=5A22108029-gonal pyramidal numbers: a(n) = n*(n+1)*(9*n-8)/2.at n=31A256649