# A019077 (b-file synthesized from sequence entry) 3 0 4 0 5 4 6 6 7 4 8 16 9 46 10 84 11 224 12 558 13 1380 14 3418 15 9272 16 23340 17 58462 18 153503 19 404026 20 1041448 21 2725482 22 7226277 23 19073734 24 50488500 25 134468292 26 358721980 27 958690662 28 2570501823 29 6906337888 30 18589047554