# A006363 (b-file synthesized from sequence entry) 0 1 1 168 2 7581 3 160948 4 2068224 5 18561984 6 127234008 7 706987164 8 3320153661 9 13583619496 10 49530070161 11 163806121656 12 498180781144 13 1408758106368 14 3737505070344 15 9372218674824 16 22351423903953 17 50960797533096 18 111574385244253 19 235475590500876 20 480631725411720 21 951504952784320 22 1831615165328400 23 3435931869872580