# A268409 (b-file synthesized from sequence entry) 0 3 1 5 2 26 3 114 4 508 5 2260 6 10056 7 44744 8 199088 9 885840 10 3941536 11 17537824 12 78034368 13 347213120 14 1544921216 15 6874111104 16 30586286848 17 136093369600 18 605546052096 19 2694370947584 20 11988575894528 21 53343045473280 22 237349333682176 23 1056083425675264