# A007511 (b-file synthesized from sequence entry) 1 2 2 50 3 325 4 1105 5 5525 6 27625 7 71825 8 138125 9 160225 10 801125 11 2082925 12 4005625 13 5928325 14 29641625 15 77068225 16 148208125 17 243061325 18 1215306625 19 3159797225 20 6076533125 21 12882250225 22 53716552825 23 64411251125 24 167469252925 25 322056255625 26 785817263725