# A025970 (b-file synthesized from sequence entry) 0 1 1 24 2 388 3 5376 4 69328 5 862848 6 10547776 7 127767552 8 1540506880 9 18530383872 10 222632510464 11 2673205936128 12 32088199647232 13 385116900458496 14 4621754370506752 15 55463163983560704 16 665570645617475584