# A187981 (b-file synthesized from sequence entry) 1 0 2 2 3 5 4 15 5 57 6 181 7 632 8 2199 9 7593 10 26706 11 93724 12 330555 13 1170088 14 4149361 15 14754670 16 52564714 17 187595025 18 670589799 19 2400467901 20 8603906865 21 30874479617 22 110907636467 23 398789645747 24 1435195800184 25 5169318396770 26 18633022691923 27 67210498566801 28 242590233305619 29 876138147816208 30 3166048659124955 31 11447024096561941 32 41407915745717488