1782288

Appears in sequences

• a(1) = 1, then add, multiply and subtract 2, 3, 4; 5, 6, 7; ... in that order.at n=17A077383
• a(n) = n! [x^n] exp(2*x)*(y*sinh(x*y) + cosh(x*y)) and y = sqrt(x).at n=11A335537