# A001213 (b-file synthesized from sequence entry) 1 3 2 7 3 15 4 24 5 36 6 52 7 70 8 93 9 121 10 154 11 186 12 225 13 271 14 323 15 385 16 450 17 515 18 606 19 684 20 788 21 865 22 977 23 1091 24 1201 25 1361