# A092266 (b-file synthesized from sequence entry) 0 1 1 4 2 4 3 16 4 36 5 144 6 400 7 1600 8 4900 9 19600 10 63504 11 254016 12 853776 13 3415104 14 11778624 15 47114496 16 165636900 17 662547600 18 2363904400 19 9455617600 20 34134779536 21 136539118144 22 497634306624 23 1990537226496 24 7312459672336