# A305823 (b-file synthesized from sequence entry) 0 0 1 1 2 3 3 8 4 20 5 53 6 136 7 383 8 1067 9 3292 10 10162 11 34586 12 118332 13 441898 14 1660947 15 6745710 16 27575425 17 120801230 18 532530170 19 2499230441 20 11800052796 21 58992236094 22 296630364605 23 1572128197439 24 8378539879636 25 46882666240016 26 263735138346443 27 1552510947814406