# A037704 (b-file synthesized from sequence entry) 1 1 2 9 3 54 4 326 5 1957 6 11745 7 70470 8 422822 9 2536933 10 15221601 11 91329606 12 547977638 13 3287865829 14 19727194977 15 118363169862 16 710179019174 17 4261074115045 18 25566444690273 19 153398668141638 20 920392008849830 21 5522352053098981