# A097832 (b-file synthesized from sequence entry) 0 1 1 20 2 380 3 7201 4 136440 5 2585160 6 48981601 7 928065260 8 17584258340 9 333172843201 10 6312699762480 11 119608122643920 12 2266241630472001 13 42938982856324100 14 813574432639685900 15 15414975237297708001