# A151500 (b-file synthesized from sequence entry) 0 1 1 1 2 5 3 28 4 202 5 1634 6 14356 7 134442 8 1320582 9 13475838 10 141858494 11 1532365936 12 16917613816 13 190293921824 14 2175382137928 15 25222807343938 16 296126634648206 17 3515506441807942 18 42152202377678462 19 509971838967101524 20 6220118724701272900 21 76429469578696026476 22 945490543715011286048