# A117887 (b-file synthesized from sequence entry) 1 1 2 4 3 20 4 145 5 1441 6 18248 7 280392 8 5063361 9 105063361 10 2463011052 11 64380375276 12 1856540769313 13 58550453144609 14 2004745521503984 15 74062339559431920 16 2936485391069247713 17 124376016487663499489 18 5604762874272465685428